question

SammyCat-6158 avatar image
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SammyCat-6158 asked DSPatrick commented

Single DC unable to see itself as the PDC - Warning: DcGetDcName(PDC_REQUIRED) call failed, error 1355 A Primary Domain Controller could not be located.

Over the past year or so, one of our clients directories has been having some serious Active Directory Synchronisation issues. In the current state, the Active Directory Domain Controller cannot view itself as the PDC, even though the _msdcs Forward Lookup Zone is configured correctly and all FSMO roles have been seized.


Windows IP Configuration

Host Name . . . . . . . . . . . . : BETDC02
Primary Dns Suffix . . . . . . . : mydomain.local
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : mydomain.local

Ethernet adapter Ethernet0:

Connection-specific DNS Suffix . : mydomain.local
Description . . . . . . . . . . . : vmxnet3 Ethernet Adapter
Physical Address. . . . . . . . . : 00-0C-29-3B-68-3B
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::497b:407d:faea:fc2a%13(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.20.51(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.20.1
DHCPv6 IAID . . . . . . . . . . . : 100666409
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-25-36-71-1E-00-0C-29-3B-68-3B
DNS Servers . . . . . . . . . . . : ::1
192.168.20.51
NetBIOS over Tcpip. . . . . . . . : Enabled

This is a virtual machine hosted in VMWare, when trying to promote another domain controller to this domain I get an error in the Server Manager wizard informing me that a Domain Controller cannot be found in this domain.

Any help would be greatly appreciated. I am at my wits end here.

windows-active-directory
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DSPatrick avatar image
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DSPatrick answered SammyCat-6158 commented

Also add the server's own static ip address (192.168.20.51) plus loopback (127.0.0.1) listed for DNS then do ipconfig /flushdns, ipconfig /registerdns, restart the netlogon service.
If no joy then please run;

Dcdiag /v /c /d /e /s:%computername% >C:\dcdiag.log
repadmin /showrepl >C:\repl.txt
ipconfig /all > C:\dc1.txt
ipconfig /all > C:\dc2.txt
ipconfig /all > C:\dc3.txt

then put unzipped text files up on OneDrive and share a link.















· 1
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@DSPatrick - thanks for the response, tried that - no luck

Requested files as attached below:
https://1drv.ms/u/s!At6wjMWry_xbgVHOvElpPgta1-Sb?e=0bQODF

Cheers!

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DSPatrick avatar image
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DSPatrick answered SammyCat-6158 commented
  • The Remote Procedure Call (RpcSs) service should be set to auto start.

  • Odd that there's a system event log message complains that this DC has a dynamic IPv6 address which if true would be problematic.

  • Have you rebooted it recently?

  • Does it get the domain network profile?

  • computer time is correct?

Also check the time service configuration is correct. For PDCe

w32tm /unregister
net stop w32time
w32tm /register
net start w32time
w32tm /config /manualpeerlist:<ntp ip address> /syncfromflags:manual /reliable:yes /update
net stop w32time
net start w32time
then check
w32tm /query /source
w32tm /query /configuration


https://tf.nist.gov/tf-cgi/servers.cgi












· 1
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Hey @DSPatrick

  • Just set RpcSs to Automatic Start

  • The IPv6 protocol has been turned off, I'm not sure why it's showing that in the Sys event log, it must be an older event

  • I have rebooted the server recently, yes - in the past 20 minutes or so

  • Yes, it does get the domain network profile

  • The computer time is correct

It's a real headscratcher this.



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DSPatrick avatar image
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DSPatrick answered DSPatrick commented

I'm not sure why it's showing that in the Sys event log, it must be an older event

It was in the last 60 minutes prior to dcdiag

The computer time is correct

still wouldn't hurt to check
w32tm /query /source
w32tm /query /configuration






· 1
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Just checking if there's any progress or updates?

--please don't forget to upvote and Accept as answer if the reply is helpful--



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