Secondary DC cant be contacted and does not autnenticate users

Anonymous
2024-03-05T17:19:30+00:00

I have a primary DC (win 2k19) managing a network and decided to add a 2nd DC in case of any failure for the PDC. The 2nd DC is on win 2k22, setup went OK and it seems that replication was OK as well, time is synced between both. When I shut down the PDC and tried to check that secondary DC will act and respond, it did not work, doing nslookup from client, it does not work.

Issuing

repadmin /syncall

It finishes with no error and I get

CALLBACK MESSAGE: The following replication is in progress:

From: 29c8443d-0f97-4f29-8027-3e1a00a62d07.\_msdcs.mynetwork.net 

To  : f6f0aec0-7246-4cf6-92bf-891f95e53242.\_msdcs.mynetwork.net 

CALLBACK MESSAGE: The following replication completed successfully:

From: 29c8443d-0f97-4f29-8027-3e1a00a62d07.\_msdcs.mynetwork.net 

To  : f6f0aec0-7246-4cf6-92bf-891f95e53242.\_msdcs.mynetwork.net 

CALLBACK MESSAGE: SyncAll Finished.

SyncAll terminated with no errors.

When I visit Sites and Services, I see both DCs clicking on NTDS, I see "Automatically generated From Server DC2 and on NTDS on the 2nd DC I see "Automatically generated From DC1

DNS in IP4 on DC1 is configured with IP of DC2 and 127.0.0.1 as alternate

DNS in IP4 on DC2 is configured with IP of DC1 and 127.0.0.1 as alternate

Win 10 clients can ping both DCS. When I run

nslookup on a client I get only the ip of DC1

tunnpng nslookup on DC1 it displays correctly the name and ip of DC2.

Running

netdom query fsmo

on botc DCs gives same output for Schema master, Domain naming master, PDC, RID pool manager and Infrastructure master.

Firewall on DC2 is disabled

Thanks for your help

Windows Server Identity and access Active Directory

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  1. Anonymous
    2024-03-06T07:08:31+00:00

    Hello Salam ELIAS,

    Thank you for posting in Microsoft Community forum.

    Based on the description "and tried to check that secondary DC will act and respond, it did not work, doing nslookup from client, it does not work.", what do you mean it did not work?

    You can check AD replication by running commands on PDC.
    repadmin /showrepl >C:\rep1.txt
    repadmin /replsum >C:\rep2.txt

    repadmin /showrepl * /csv >c:\repsum.csv

    You can run Dcdiag/v on new DC and check the result.

    I hope the information above is helpful.

    If you have any question or concern, please feel free to let us know.

    Best Regards,
    Daisy Zhou

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  2. Anonymous
    2024-03-06T08:58:30+00:00

    Hi Daisy, by "it did not work" I mean that when I shut down DC1, the DC2 does not authenticate when I try to login to domain as well as I cant browse the internet. I need to bring back DC1 so I can work. Also, as I said, issuing nslookup against DC2 always errors and responds with unknown.

    Here is the output of repadmin /showrepl > C:\rep1.txt which indicates everything is successful

    Repadmin: running command /showrepl against full DC localhost Default-First-Site-Name\SALAMMAIN-DC02 DSA Options: IS_GC Site Options: (none) DSA object GUID: f6f0aec0-7246-4cf6-92bf-891f95e53242 DSA invocationID: c122370e-3bdd-4b72-bc4c-cd97ecac5743 ==== INBOUND NEIGHBORS ====================================== DC=salam,DC=net Default-First-Site-Name\SALAMMAIN via RPC DSA object GUID: 29c8443d-0f97-4f29-8027-3e1a00a62d07 Last attempt @ 2024-03-06 09:37:18 was successful. CN=Configuration,DC=salam,DC=net Default-First-Site-Name\SALAMMAIN via RPC DSA object GUID: 29c8443d-0f97-4f29-8027-3e1a00a62d07 Last attempt @ 2024-03-05 22:50:17 was successful.

    CN=Schema,CN=Configuration,DC=salam,DC=net Default-First-Site-Name\SALAMMAIN via RPC DSA object GUID: 29c8443d-0f97-4f29-8027-3e1a00a62d07 Last attempt @ 2024-03-05 22:50:17 was successful.

    DC=DomainDnsZones,DC=salam,DC=net Default-First-Site-Name\SALAMMAIN via RPC DSA object GUID: 29c8443d-0f97-4f29-8027-3e1a00a62d07 Last attempt @ 2024-03-06 09:37:00 was successful. DC=ForestDnsZones,DC=salam,DC=net Default-First-Site-Name\SALAMMAIN via RPC DSA object GUID: 29c8443d-0f97-4f29-8027-3e1a00a62d07 Last attempt @ 2024-03-05 22:50:18 was successful.

    Output for repadmin /showrepl * /csv >c:\repsum.csv

    howrepl_COLUMNS,Destination DSA Site,Destination DSA,Naming Context,Source DSA Site,Source DSA,Transport Type,Number of Failures,Last Failure Time,Last Success Time,Last Failure Status

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN,"DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN-DC02,RPC,0,0,2024-03-06 09:37:14,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN,"CN=Configuration,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN-DC02,RPC,0,0,2024-03-06 09:38:46,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN,"CN=Schema,CN=Configuration,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN-DC02,RPC,1,2024-03-06 09:23:26,2024-03-05 22:53:15,8524

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN,"DC=DomainDnsZones,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN-DC02,RPC,0,0,2024-03-06 09:45:17,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN,"DC=ForestDnsZones,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN-DC02,RPC,0,0,2024-03-06 09:45:14,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN-DC02,"DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN,RPC,0,0,2024-03-06 09:44:30,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN-DC02,"CN=Configuration,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN,RPC,0,0,2024-03-06 09:38:31,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN-DC02,"CN=Schema,CN=Configuration,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN,RPC,0,0,2024-03-06 09:38:32,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN-DC02,"DC=DomainDnsZones,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN,RPC,0,0,2024-03-06 09:45:02,0

    showrepl_INFO,Default-First-Site-Name,SALAMMAIN-DC02,"DC=ForestDnsZones,DC=salam,DC=net",Default-First-Site-Name,SALAMMAIN,RPC,0,0,2024-03-06 09:44:59,0

    However, for repadmin /replsum >C:\rep2.txt, it indicates 1 fail out of 5 operations

    Replication Summary Start Time: 2024-03-06 09:45:18 Beginning data collection for replication summary, this may take awhile: .....

    Source DSA largest delta fails/total %% error SALAMMAIN 06m:47s 0 / 5 0 SALAMMAIN-DC02 10h:52m:03s 1 / 5 20 (8524) The DSA operation is unable to proceed because of a DNS lookup failure.

    Destination DSA largest delta fails/total %% error SALAMMAIN 10h:52m:03s 1 / 5 20 (8524) The DSA operation is unable to proceed because of a DNS lookup failure. SALAMMAIN-DC02 06m:47s 0 / 5 0

    For dcdiag /v, most test tests are passed except a couple of warninings/errors regarding sysvol ()

    Directory Server Diagnosis

    Performing initial setup:

    Trying to find home server...

    * Verifying that the local machine salammain-dc02, is a Directory Server.

    Home Server = salammain-dc02

    * Connecting to directory service on server salammain-dc02.

    * Identified AD Forest.

    Collecting AD specific global data

    * Collecting site info.

    Calling ldap_search_init_page(hld,CN=Sites,CN=Configuration,DC=salam,DC=net,LDAP_SCOPE_SUBTREE,(objectCategory=ntDSSiteSettings),.......

    The previous call succeeded

    Iterating through the sites

    Looking at base site object: CN=NTDS Site Settings,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net

    Getting ISTG and options for the site

    * Identifying all servers.

    Calling ldap_search_init_page(hld,CN=Sites,CN=Configuration,DC=salam,DC=net,LDAP_SCOPE_SUBTREE,(objectClass=ntDSDsa),.......

    The previous call succeeded....

    The previous call succeeded

    Iterating through the list of servers

    Getting information for the server CN=NTDS Settings,CN=SALAMMAIN,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net

    objectGuid obtained

    InvocationID obtained

    dnsHostname obtained

    site info obtained

    All the info for the server collected

    Getting information for the server CN=NTDS Settings,CN=SALAMMAIN-DC02,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net

    objectGuid obtained

    InvocationID obtained

    dnsHostname obtained

    site info obtained

    All the info for the server collected

    * Identifying all NC cross-refs.

    * Found 2 DC(s). Testing 1 of them.

    Done gathering initial info.

    Doing initial required tests

    Testing server: Default-First-Site-Name\SALAMMAIN-DC02

      Starting test: Connectivity  
    
         \* Active Directory LDAP Services Check 
    
         Determining IP4 connectivity  
    
         \* Active Directory RPC Services Check 
    
         ......................... SALAMMAIN-DC02 passed test Connectivity  
    

    Doing primary tests

    Testing server: Default-First-Site-Name\SALAMMAIN-DC02

      Starting test: Advertising  
    
         Warning: DsGetDcName returned information for \\SALAMMAIN.salam.net,  
    
         when we were trying to reach SALAMMAIN-DC02.  
    
         SERVER IS NOT RESPONDING or IS NOT CONSIDERED SUITABLE.  
    
         ......................... SALAMMAIN-DC02 failed test Advertising  
    
      Test omitted by user request: CheckSecurityError  
    
      Test omitted by user request: CutoffServers  
    
      Starting test: FrsEvent  
    
         \* The File Replication Service Event log test  
    
         Skip the test because the server is running DFSR.  
    
         ......................... SALAMMAIN-DC02 passed test FrsEvent  
    
      Starting test: DFSREvent  
    
         The DFS Replication Event Log.  
    
         There are warning or error events within the last 24 hours after the  
    
         SYSVOL has been shared.  Failing SYSVOL replication problems may cause  
    
         Group Policy problems.  
    
         A warning event occurred.  EventID: 0x80001396  
    
            Time Generated: 03/05/2024   14:58:55  
    
            Event String:  
    
            The DFS Replication service is stopping communication with partner SALAMMAIN for replication group Domain System Volume due to an error. The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1722 (The RPC server is unavailable.)   
    
            Connection ID: C79DEF37-01A2-4594-BDAE-10D9E403AEC3   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC000138A  
    
            Time Generated: 03/05/2024   14:59:09  
    
            Event String:  
    
            The DFS Replication service encountered an error communicating with partner SALAMMAIN for replication group Domain System Volume.   
    
            Partner DNS address: SALAMMAIN.salam.net   
    
            Optional data if available:   
    
            Partner WINS Address: SALAMMAIN   
    
            Partner IP Address: 192.168.1.13   
    
            The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1825 (A security package specific error occurred.)   
    
            Connection ID: C79DEF37-01A2-4594-BDAE-10D9E403AEC3   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC0001204  
    
            Time Generated: 03/05/2024   14:59:09  
    
            Event String:  
    
            The DFS Replication service initialized SYSVOL at local path C:\Windows\SYSVOL\domain and is waiting to perform initial replication. The replicated folder will remain in the initial synchronization state until it has replicated with its partner SALAMMAIN.salam.net. If the server was in the process of being promoted to a domain controller, the domain controller will not advertise and function as a domain controller until this issue is resolved. This can occur if the specified partner is also in the initial synchronization state, or if sharing violations are encountered on this server or the sync partner. If this event occurred during the migration of SYSVOL from File Replication service (FRS) to DFS Replication, changes will not replicate out until this issue is resolved. This can cause the SYSVOL folder on this server to become out of sync with other domain controllers.   
    
            Additional Information:   
    
            Replicated Folder Name: SYSVOL Share   
    
            Replicated Folder ID: 82E8AEE2-1577-4FBD-A5B3-2564BEFABB9F   
    
            Replication Group Name: Domain System Volume   
    
            Replication Group ID: C79DEF37-01A2-4594-BDAE-10D9E403AEC3   
    
            Member ID: FBB5D769-3E8B-4FCA-9C84-D6C1AD6CC205   
    
            Read-Only: 0  
    
         An error event occurred.  EventID: 0xC000138A  
    
            Time Generated: 03/05/2024   15:07:26  
    
            Event String:  
    
            The DFS Replication service encountered an error communicating with partner SALAMMAIN for replication group Domain System Volume.   
    
            Partner DNS address: SALAMMAIN.salam.net   
    
            Optional data if available:   
    
            Partner WINS Address: SALAMMAIN   
    
            Partner IP Address: 192.168.1.13   
    
            The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1825 (A security package specific error occurred.)   
    
            Connection ID: C79DEF37-01A2-4594-BDAE-10D9E403AEC3   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC0001204  
    
            Time Generated: 03/05/2024   15:07:26  
    
            Event String:  
    
            The DFS Replication service initialized SYSVOL at local path C:\Windows\SYSVOL\domain and is waiting to perform initial replication. The replicated folder will remain in the initial synchronization state until it has replicated with its partner SALAMMAIN.salam.net. If the server was in the process of being promoted to a domain controller, the domain controller will not advertise and function as a domain controller until this issue is resolved. This can occur if the specified partner is also in the initial synchronization state, or if sharing violations are encountered on this server or the sync partner. If this event occurred during the migration of SYSVOL from File Replication service (FRS) to DFS Replication, changes will not replicate out until this issue is resolved. This can cause the SYSVOL folder on this server to become out of sync with other domain controllers.   
    
            Additional Information:   
    
            Replicated Folder Name: SYSVOL Share   
    
            Replicated Folder ID: 82E8AEE2-1577-4FBD-A5B3-2564BEFABB9F   
    
            Replication Group Name: Domain System Volume   
    
            Replication Group ID: C79DEF37-01A2-4594-BDAE-10D9E403AEC3   
    
            Member ID: FBB5D769-3E8B-4FCA-9C84-D6C1AD6CC205   
    
            Read-Only: 0  
    
         A warning event occurred.  EventID: 0x80001396  
    
            Time Generated: 03/05/2024   16:24:32  
    
            Event String:  
    
            The DFS Replication service is stopping communication with partner SALAMMAIN for replication group Domain System Volume due to an error. The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1722 (The RPC server is unavailable.)   
    
            Connection ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC0001390  
    
            Time Generated: 03/05/2024   16:27:35  
    
            Event String:  
    
            The DFS Replication service failed to communicate with partner SALAMMAIN for replication group Domain System Volume. This error can occur if the host is unreachable, or if the DFS Replication service is not running on the server.   
    
            Partner DNS Address: SALAMMAIN.salam.net   
    
            Optional data if available:   
    
            Partner WINS Address: SALAMMAIN   
    
            Partner IP Address: 192.168.1.13   
    
            The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1722 (The RPC server is unavailable.)   
    
            Connection ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC0001204  
    
            Time Generated: 03/05/2024   16:27:35  
    
            Event String:  
    
            The DFS Replication service initialized SYSVOL at local path C:\Windows\SYSVOL\domain and is waiting to perform initial replication. The replicated folder will remain in the initial synchronization state until it has replicated with its partner SALAMMAIN.salam.net. If the server was in the process of being promoted to a domain controller, the domain controller will not advertise and function as a domain controller until this issue is resolved. This can occur if the specified partner is also in the initial synchronization state, or if sharing violations are encountered on this server or the sync partner. If this event occurred during the migration of SYSVOL from File Replication service (FRS) to DFS Replication, changes will not replicate out until this issue is resolved. This can cause the SYSVOL folder on this server to become out of sync with other domain controllers.   
    
            Additional Information:   
    
            Replicated Folder Name: SYSVOL Share   
    
            Replicated Folder ID: 82E8AEE2-1577-4FBD-A5B3-2564BEFABB9F   
    
            Replication Group Name: Domain System Volume   
    
            Replication Group ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Member ID: FBB5D769-3E8B-4FCA-9C84-D6C1AD6CC205   
    
            Read-Only: 0  
    
         An error event occurred.  EventID: 0xC0001390  
    
            Time Generated: 03/05/2024   16:34:23  
    
            Event String:  
    
            The DFS Replication service failed to communicate with partner SALAMMAIN for replication group Domain System Volume. This error can occur if the host is unreachable, or if the DFS Replication service is not running on the server.   
    
            Partner DNS Address: SALAMMAIN.salam.net   
    
            Optional data if available:   
    
            Partner WINS Address: SALAMMAIN   
    
            Partner IP Address: 192.168.1.13   
    
            The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1722 (The RPC server is unavailable.)   
    
            Connection ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC0001204  
    
            Time Generated: 03/05/2024   16:34:23  
    
            Event String:  
    
            The DFS Replication service initialized SYSVOL at local path C:\Windows\SYSVOL\domain and is waiting to perform initial replication. The replicated folder will remain in the initial synchronization state until it has replicated with its partner SALAMMAIN.salam.net. If the server was in the process of being promoted to a domain controller, the domain controller will not advertise and function as a domain controller until this issue is resolved. This can occur if the specified partner is also in the initial synchronization state, or if sharing violations are encountered on this server or the sync partner. If this event occurred during the migration of SYSVOL from File Replication service (FRS) to DFS Replication, changes will not replicate out until this issue is resolved. This can cause the SYSVOL folder on this server to become out of sync with other domain controllers.   
    
            Additional Information:   
    
            Replicated Folder Name: SYSVOL Share   
    
            Replicated Folder ID: 82E8AEE2-1577-4FBD-A5B3-2564BEFABB9F   
    
            Replication Group Name: Domain System Volume   
    
            Replication Group ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Member ID: FBB5D769-3E8B-4FCA-9C84-D6C1AD6CC205   
    
            Read-Only: 0  
    
         An error event occurred.  EventID: 0xC0001390  
    
            Time Generated: 03/05/2024   16:50:45  
    
            Event String:  
    
            The DFS Replication service failed to communicate with partner SALAMMAIN for replication group Domain System Volume. This error can occur if the host is unreachable, or if the DFS Replication service is not running on the server.   
    
            Partner DNS Address: SALAMMAIN.salam.net   
    
            Optional data if available:   
    
            Partner WINS Address: SALAMMAIN   
    
            Partner IP Address: 192.168.1.13   
    
            The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1722 (The RPC server is unavailable.)   
    
            Connection ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC0001204  
    
            Time Generated: 03/05/2024   16:50:45  
    
            Event String:  
    
            The DFS Replication service initialized SYSVOL at local path C:\Windows\SYSVOL\domain and is waiting to perform initial replication. The replicated folder will remain in the initial synchronization state until it has replicated with its partner SALAMMAIN.salam.net. If the server was in the process of being promoted to a domain controller, the domain controller will not advertise and function as a domain controller until this issue is resolved. This can occur if the specified partner is also in the initial synchronization state, or if sharing violations are encountered on this server or the sync partner. If this event occurred during the migration of SYSVOL from File Replication service (FRS) to DFS Replication, changes will not replicate out until this issue is resolved. This can cause the SYSVOL folder on this server to become out of sync with other domain controllers.   
    
            Additional Information:   
    
            Replicated Folder Name: SYSVOL Share   
    
            Replicated Folder ID: 82E8AEE2-1577-4FBD-A5B3-2564BEFABB9F   
    
            Replication Group Name: Domain System Volume   
    
            Replication Group ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Member ID: FBB5D769-3E8B-4FCA-9C84-D6C1AD6CC205   
    
            Read-Only: 0  
    
         An error event occurred.  EventID: 0xC0001390  
    
            Time Generated: 03/05/2024   17:53:28  
    
            Event String:  
    
            The DFS Replication service failed to communicate with partner SALAMMAIN for replication group Domain System Volume. This error can occur if the host is unreachable, or if the DFS Replication service is not running on the server.   
    
            Partner DNS Address: SALAMMAIN.salam.net   
    
            Optional data if available:   
    
            Partner WINS Address: SALAMMAIN   
    
            Partner IP Address: 192.168.1.13   
    
            The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1722 (The RPC server is unavailable.)   
    
            Connection ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         An error event occurred.  EventID: 0xC0001204  
    
            Time Generated: 03/05/2024   17:53:28  
    
            Event String:  
    
            The DFS Replication service initialized SYSVOL at local path C:\Windows\SYSVOL\domain and is waiting to perform initial replication. The replicated folder will remain in the initial synchronization state until it has replicated with its partner SALAMMAIN.salam.net. If the server was in the process of being promoted to a domain controller, the domain controller will not advertise and function as a domain controller until this issue is resolved. This can occur if the specified partner is also in the initial synchronization state, or if sharing violations are encountered on this server or the sync partner. If this event occurred during the migration of SYSVOL from File Replication service (FRS) to DFS Replication, changes will not replicate out until this issue is resolved. This can cause the SYSVOL folder on this server to become out of sync with other domain controllers.   
    
            Additional Information:   
    
            Replicated Folder Name: SYSVOL Share   
    
            Replicated Folder ID: 82E8AEE2-1577-4FBD-A5B3-2564BEFABB9F   
    
            Replication Group Name: Domain System Volume   
    
            Replication Group ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Member ID: FBB5D769-3E8B-4FCA-9C84-D6C1AD6CC205   
    
            Read-Only: 0  
    
         A warning event occurred.  EventID: 0x80001396  
    
            Time Generated: 03/06/2024   09:37:57  
    
            Event String:  
    
            The DFS Replication service is stopping communication with partner SALAMMAIN for replication group Domain System Volume due to an error. The service will retry the connection periodically.   
    
            Additional Information:   
    
            Error: 1726 (The remote procedure call failed.)   
    
            Connection ID: 2CDB071D-6CCC-4ACF-8995-A9EF756260C7   
    
            Replication Group ID: 7DCB147C-6418-4860-A791-5A65EFA40277  
    
         ......................... SALAMMAIN-DC02 failed test DFSREvent  
    
      Starting test: SysVolCheck  
    
         \* The File Replication Service SYSVOL ready test  
    
         The registry lookup failed to determine the state of the SYSVOL.  The  
    
         error returned  was 0x0 "The operation completed successfully.".  
    
         Check the FRS event log to see if the SYSVOL has successfully been  
    
         shared.  
    
         ......................... SALAMMAIN-DC02 passed test SysVolCheck  
    
      Starting test: KccEvent  
    
         \* The KCC Event log test 
    
         Found no KCC errors in "Directory Service" Event log in the last 15 minutes. 
    
         ......................... SALAMMAIN-DC02 passed test KccEvent  
    
      Starting test: KnowsOfRoleHolders  
    
         Role Schema Owner = CN=NTDS Settings,CN=SALAMMAIN,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net 
    
         Role Domain Owner = CN=NTDS Settings,CN=SALAMMAIN,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net 
    
         Role PDC Owner = CN=NTDS Settings,CN=SALAMMAIN,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net 
    
         Role Rid Owner = CN=NTDS Settings,CN=SALAMMAIN,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net 
    
         Role Infrastructure Update Owner = CN=NTDS Settings,CN=SALAMMAIN,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net 
    
         ......................... SALAMMAIN-DC02 passed test  
    
         KnowsOfRoleHolders  
    
      Starting test: MachineAccount  
    
         Checking machine account for DC SALAMMAIN-DC02 on DC SALAMMAIN-DC02. 
    
         \* SPN found :LDAP/salammain-dc02.salam.net/salam.net 
    
         \* SPN found :LDAP/salammain-dc02.salam.net 
    
         \* SPN found :LDAP/SALAMMAIN-DC02 
    
         \* SPN found :LDAP/salammain-dc02.salam.net/SALAM 
    
         \* SPN found :LDAP/f6f0aec0-7246-4cf6-92bf-891f95e53242.\_msdcs.salam.net 
    
         \* SPN found :E3514235-4B06-11D1-AB04-00C04FC2DCD2/f6f0aec0-7246-4cf6-92bf-891f95e53242/salam.net 
    
         \* SPN found :HOST/salammain-dc02.salam.net/salam.net 
    
         \* SPN found :HOST/salammain-dc02.salam.net 
    
         \* SPN found :HOST/SALAMMAIN-DC02 
    
         \* SPN found :HOST/salammain-dc02.salam.net/SALAM 
    
         \* SPN found :GC/salammain-dc02.salam.net/salam.net 
    
         ......................... SALAMMAIN-DC02 passed test MachineAccount  
    
      Starting test: NCSecDesc  
    
         \* Security Permissions check for all NC's on DC SALAMMAIN-DC02. 
    
         \* Security Permissions Check for  
    
           DC=ForestDnsZones,DC=salam,DC=net 
    
            (NDNC,Version 3) 
    
         \* Security Permissions Check for  
    
           DC=DomainDnsZones,DC=salam,DC=net 
    
            (NDNC,Version 3) 
    
         \* Security Permissions Check for  
    
           CN=Schema,CN=Configuration,DC=salam,DC=net 
    
            (Schema,Version 3) 
    
         \* Security Permissions Check for  
    
           CN=Configuration,DC=salam,DC=net 
    
            (Configuration,Version 3) 
    
         \* Security Permissions Check for  
    
           DC=salam,DC=net 
    
            (Domain,Version 3) 
    
         ......................... SALAMMAIN-DC02 passed test NCSecDesc  
    
      Starting test: NetLogons  
    
         \* Network Logons Privileges Check 
    
         Unable to connect to the NETLOGON share! (\\SALAMMAIN-DC02\netlogon)  
    
         [SALAMMAIN-DC02] An net use or LsaPolicy operation failed with error  
    
         67, The network name cannot be found..  
    
         ......................... SALAMMAIN-DC02 failed test NetLogons  
    
      Starting test: ObjectsReplicated  
    
         SALAMMAIN-DC02 is in domain DC=salam,DC=net 
    
         Checking for CN=SALAMMAIN-DC02,OU=Domain Controllers,DC=salam,DC=net in domain DC=salam,DC=net on 1 servers 
    
            Object is up-to-date on all servers. 
    
         Checking for CN=NTDS Settings,CN=SALAMMAIN-DC02,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=salam,DC=net in domain CN=Configuration,DC=salam,DC=net on 1 servers 
    
            Object is up-to-date on all servers. 
    
         ......................... SALAMMAIN-DC02 passed test ObjectsReplicated  
    
      Test omitted by user request: OutboundSecureChannels  
    
      Starting test: Replications  
    
         \* Replications Check 
    
         \* Replication Latency Check 
    
            DC=ForestDnsZones,DC=salam,DC=net 
    
               Latency information for 1 entries in the vector were ignored. 
    
                  1 were retired Invocations.  0 were either: read-only replicas and are not verifiably latent, or dc's no longer replicating this nc.  0 had no latency information (Win2K DC).   
    
            DC=DomainDnsZones,DC=salam,DC=net 
    
               Latency information for 1 entries in the vector were ignored. 
    
                  1 were retired Invocations.  0 were either: read-only replicas and are not verifiably latent, or dc's no longer replicating this nc.  0 had no latency information (Win2K DC).   
    
            CN=Schema,CN=Configuration,DC=salam,DC=net 
    
               Latency information for 1 entries in the vector were ignored. 
    
                  1 were retired Invocations.  0 were either: read-only replicas and are not verifiably latent, or dc's no longer replicating this nc.  0 had no latency information (Win2K DC).   
    
            CN=Configuration,DC=salam,DC=net 
    
               Latency information for 1 entries in the vector were ignored. 
    
                  1 were retired Invocations.  0 were either: read-only replicas and are not verifiably latent, or dc's no longer replicating this nc.  0 had no latency information (Win2K DC).   
    
            DC=salam,DC=net 
    
               Latency information for 1 entries in the vector were ignored. 
    
                  1 were retired Invocations.  0 were either: read-only replicas and are not verifiably latent, or dc's no longer replicating this nc.  0 had no latency information (Win2K DC).   
    
         ......................... SALAMMAIN-DC02 passed test Replications  
    
      Starting test: RidManager  
    
         \* Available RID Pool for the Domain is 2600 to 1073741823 
    
         \* SALAMMAIN.salam.net is the RID Master 
    
         \* DsBind with RID Master was successful 
    
         \* rIDAllocationPool is 2100 to 2599 
    
         \* rIDPreviousAllocationPool is 2100 to 2599 
    
         \* rIDNextRID: 2100 
    
         ......................... SALAMMAIN-DC02 passed test RidManager  
    
      Starting test: Services  
    
         \* Checking Service: EventSystem 
    
         \* Checking Service: RpcSs 
    
         \* Checking Service: NTDS 
    
         \* Checking Service: DnsCache 
    
         \* Checking Service: DFSR 
    
         \* Checking Service: IsmServ 
    
         \* Checking Service: kdc 
    
         \* Checking Service: SamSs 
    
         \* Checking Service: LanmanServer 
    
         \* Checking Service: LanmanWorkstation 
    
         \* Checking Service: w32time 
    
         \* Checking Service: NETLOGON 
    
         ......................... SALAMMAIN-DC02 passed test Services  
    
      Starting test: SystemLog  
    
         \* The System Event log test 
    
         A warning event occurred.  EventID: 0x00000024  
    
            Time Generated: 03/06/2024   09:36:41  
    
            Event String:  
    
            The time service has not synchronized the system time for the last 38010 seconds because none of the time service providers provided a usable time stamp. The time service will not update the local system time until it is able to synchronize with a time source. If the local system is configured to act as a time server for clients, it will stop advertising as a time source to clients after 60429 seconds. The time service will continue to retry and sync time with its time sources. Check system event log for other W32time events for more details. Run 'w32tm /resync' to force an instant time synchronization. You can control the frequency of the time source rediscovery using ClockHoldoverPeriod W32time config setting. Modify the EventLogFlags W32time config setting if you wish to disable this message.  
    
         A warning event occurred.  EventID: 0x00000081  
    
            Time Generated: 03/06/2024   09:36:43  
    
            Event String:  
    
            NtpClient was unable to set a domain peer to use as a time source because of discovery error. NtpClient will try again in 15 minutes and double the reattempt interval thereafter. The error was: The entry is not found. (0x800706E1)  
    
         A warning event occurred.  EventID: 0x00000081  
    
            Time Generated: 03/06/2024   09:37:25  
    
            Event String:  
    
            NtpClient was unable to set a domain peer to use as a time source because of discovery error. NtpClient will try again in 15 minutes and double the reattempt interval thereafter. The error was: The entry is not found. (0x800706E1)  
    
         Found no
    
    0 comments No comments
  3. Anonymous
    2024-03-07T06:19:11+00:00

    Hello Salam ELIAS,

    Good day!

    I understand you have two DCs.

    SALAMMAIN and SALAMMAIN-DC02, now from the error message below, it seems there is DNS resolution issue.

    (8524) The DSA operation is unable to proceed because of a DNS lookup failure.

    Please check:

    1.Have you installed DNS roles on both DCs ( SALAMMAIN and SALAMMAIN-DC02)?

    2.On SALAMMAIN, can you ping domain.com and ping SALAMMAIN-DC02.domain.com and ping IP address of SALAMMAIN-DC02,and check the result.

    3.If you have installed DNS roles on both DCs. You can try to set the IP address of SALAMMAIN and 127.0.0.1 for Preferred DNS on SALAMMAIN.

    And set the IP address of SALAMMAIN and 127.0.0.1 for Preferred DNS on SALAMMAIN-DC02.

    If you have any question or concern, please feel free to let us know.

    Best Regards,
    Daisy Zhou

    0 comments No comments
  4. Anonymous
    2024-03-07T09:29:52+00:00

    Hi, Yes both SALAMMAIN and SALAMMAIN-DC02 have DNS roles

    This is screenshot for DC2 DNS

    Screenshot for DC1

    On DC1 SALAMMAIN, ping salam.net shows the IP of DC 2

    C:\Users\salam>ping salam.net

    Pinging salam.net [192.168.1.24] with 32 bytes of data:

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Ping statistics for 192.168.1.24:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), 
    

    Approximate round trip times in milli-seconds:

    Minimum = 0ms, Maximum = 0ms, Average = 0ms
    

    and ping SALAMMAIN-DC02.salam.net is also successful as you can notice

    C:\Users\salam>ping SALAMMAIN-DC02.salam.net

    Pinging salammain-dc02.salam.net [192.168.1.24] with 32 bytes of data:

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Reply from 192.168.1.24: bytes=32 time<1ms TTL=128

    Ping statistics for 192.168.1.24:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), 
    

    Approximate round trip times in milli-seconds:

    Minimum = 0ms, Maximum = 0ms, Average = 0ms
    

    Regarding IP config:

    On DC1 SALAMMAIN, it has Prefered DNS the IP of DC2 and 127.0.0.1 as alternate

    On DC2, SALAMMAIN-DC02 it has Prefered DNS the IP of DC1 and 127.0.0.1 as alternate

    0 comments No comments
  5. Anonymous
    2024-03-07T13:18:11+00:00

    I have just done another test, while both DCs ar up and running, on a win 10 client I issued

    nslookup salam.net

    I got the following result

    Server: SALAMMAIN.salam.net

    Address: 192.168.1.13

    Name: salam.net

    Addresses: 2a01:e0a:322:14d1:ae19:79f1:d859:bec5

          192.168.1.24 
    
          192.168.1.13
    

    I disabled the NIC card on DC1, the primary I use since long time, I get DNS request timed ou as follows

    DNS request timed out.

    timeout was 2 seconds. 
    

    Server: UnKnown

    Address: 192.168.1.13

    DNS request timed out.

    timeout was 2 seconds. 
    

    DNS request timed out.

    timeout was 2 seconds. 
    

    DNS request timed out.

    timeout was 2 seconds. 
    

    DNS request timed out.

    timeout was 2 seconds. 
    

    *** Request to UnKnown timed-out

    0 comments No comments