Multiple Attempts Required to Access Host vis NetBIOS Name

Question

Multiple Attempts Required to Access Host vis NetBIOS Name

mlavie 96

Hi,

First of all - this is my first time in the new Q&A site, and I feel totally lost. If there is a better place to post my question, please tell me!

And to the point:

I have a Windows Domain, running Windows Server 2019 and Windows 10 - all with latest updates.
I have two domain controllers - each a VM on 2 separate Hyper-Vs.

All hosts on the LAN have no problem seeing each other through Network browsing, and can access each other with \MyNetBIOSName and \ \MyNetBIOSName.mydomain.com

Except ... for one one - one of the 2 Hyper-Vs. If another host tries to access it with \server01.mydomain.com, it works. But if it tries \server01, I get the dreaded "network path not found". If I try again and again for maybe 20 seconds, \server01 eventually connects successfully. This is a relatively new problem - perhaps in the last month.

TIA for any help.
mlavie

Accepted answer

5 additional answers

Your answer

Answer 1

mlavie 96

Hi CandyLuo,

I finally solved this. I don't know how it happened, or why it matters - but:

I was going crazy trying to debug this. So I finally started comparing the problematic server contoso026 with an essentially identical server in the network which also has 2 NICs because it's a Hyper-V server, etc.

After hours of comparing, I saw that contoso026 had SMB1/CIFS installed, whereas no other server or laptop in the network had SMB1/CIFS installed. I have no idea who/why/when SMB1/CIFS was installed. In any case, I uninstalled it, and the problem disappeared.

Problem Solved.

Anonymous

2021-03-01T05:30:28.53+00:00

Good to hear that you have solved this issue by yourself. In addition, thanks for sharing your solution in the forum as it would be helpful to anyone who encounters similar issues.

Have a nice day! :)

Answer 2

Hi ,

Would you please post the result of running ipconfig/all at the command prompt on the computer to let us know the machine’s configuration?

Also please run the following command and then post the results:

>Nslookup server01.mydomain.com  

>Nslookup server01  

>NSlookup  
>set d2  
>server01

Note: since this is a public forum, everyone could view your information, please remove private information that might leak your privacy.

Best regards,

Candy

--------------------------------------------------------------

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Answer 3

Hi CandyLuo,

In the mean time, I tried changing the problematic server's IP address and host name, but it didn't help.

You didn't specify if I should run this on the problematic server, or one of the other hosts. So I ran it on both. The results all appear to be correct.

Run on the problematic server consoto026

PS C:\Users\administrator.contoso> ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : contoso026
   Primary Dns Suffix  . . . . . . . : contoso.org
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : contoso.org

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . : contoso.org
   Description . . . . . . . . . . . : Realtek Gaming GBE Family Controller
   Physical Address. . . . . . . . . : E0-D5-5E-C5-3D-41
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::c989:3c5c:78f2:2cc9%6(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.1(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.254
   DHCPv6 IAID . . . . . . . . . . . : 98620766
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-23-86-00-CC-E0-D5-5E-C5-3D-41
   DNS Servers . . . . . . . . . . . : 192.168.1.6
                                       192.168.1.4
   NetBIOS over Tcpip. . . . . . . . : Enabled
PS C:\Users\administrator.contoso> nslookup contoso026.contoso.org
Server:  contoso033.contoso.org
Address:  192.168.1.6

Name:    contoso026.contoso.org
Address:  192.168.1.1

PS C:\Users\administrator.contoso> nslookup contoso026
Server:  contoso033.contoso.org
Address:  192.168.1.6

Name:    contoso026.contoso.org
Address:  192.168.1.1

PS C:\Users\administrator.contoso> nslookup
Default Server:  contoso033.contoso.org
Address:  192.168.1.6

> set d2

> contoso026

Server:  contoso033.contoso.org
Address:  192.168.1.6

------------
SendRequest(), len 36
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  query, want recursion
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = A, class = IN

------------
------------
Got answer (52 bytes):
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  response, auth. answer, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = A, class = IN
    ANSWERS:
    ->  contoso026.contoso.org
        type = A, class = IN, dlen = 4
        internet address = 192.168.1.1
        ttl = 1200 (20 mins)

------------
------------
SendRequest(), len 36
    HEADER:
        opcode = QUERY, id = 3, rcode = NOERROR
        header flags:  query, want recursion
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = AAAA, class = IN

------------
------------
Got answer (92 bytes):
    HEADER:
        opcode = QUERY, id = 3, rcode = NOERROR
        header flags:  response, auth. answer, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  contoso.org
        type = SOA, class = IN, dlen = 44
        ttl = 3600 (1 hour)
        primary name server = contoso033.contoso.org
        responsible mail addr = hostmaster.contoso.org
        serial  = 66448
        refresh = 900 (15 mins)
        retry   = 600 (10 mins)
        expire  = 86400 (1 day)
        default TTL = 3600 (1 hour)

------------
Name:    contoso026.contoso.org
Address:  192.168.1.1

>

Run on another host on the system:

PS C:\WINDOWS\system32> ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : contoso034
   Primary Dns Suffix  . . . . . . . : contoso.org
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : contoso.org

Ethernet adapter Ethernet 3:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Fortinet SSL VPN Virtual Ethernet Adapter
   Physical Address. . . . . . . . . : 00-09-0F-AA-00-01
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Ethernet:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Ethernet Connection (6) I219-V
   Physical Address. . . . . . . . . : F8-75-A4-CA-32-E2
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Local Area Connection* 3:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #3
   Physical Address. . . . . . . . . : AC-67-5D-4C-B8-24
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Local Area Connection* 4:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #4
   Physical Address. . . . . . . . . : AE-67-5D-4C-B8-23
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Ethernet 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Fortinet Virtual Ethernet Adapter (NDIS 6.30)
   Physical Address. . . . . . . . . : 00-09-0F-FE-00-01
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wi-Fi:

   Connection-specific DNS Suffix  . : contoso.org
   Description . . . . . . . . . . . : Intel(R) Wireless-AC 9560 160MHz
   Physical Address. . . . . . . . . : AC-67-5D-4C-B8-23
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::3022:bcc:5ea9:2789%12(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.49(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Friday, February 19, 2021 10:34:15 AM
   Lease Expires . . . . . . . . . . : Saturday, February 27, 2021 10:34:17 AM
   Default Gateway . . . . . . . . . : 192.168.1.254
   DHCP Server . . . . . . . . . . . : 192.168.1.6
   DHCPv6 IAID . . . . . . . . . . . : 111961949
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-25-FF-B1-6B-F8-75-A4-CA-32-E2
   DNS Servers . . . . . . . . . . . : 192.168.1.4
                                       192.168.1.6
                                       213.57.2.5
                                       8.8.8.8
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter vEthernet (Default Switch):

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter
   Physical Address. . . . . . . . . : 00-15-5D-72-93-06
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::4438:76d4:701:7a59%57(Preferred)
   IPv4 Address. . . . . . . . . . . : 172.28.96.1(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.240.0
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 956306781
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-25-FF-B1-6B-F8-75-A4-CA-32-E2
   DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
                                       fec0:0:0:ffff::2%1
                                       fec0:0:0:ffff::3%1
   NetBIOS over Tcpip. . . . . . . . : Enabled
PS C:\WINDOWS\system32>


PS C:\WINDOWS\system32> Nslookup contoso026.contoso.org
Server:  contoso027.contoso.org
Address:  192.168.1.4

Name:    contoso026.contoso.org
Address:  192.168.1.1

PS C:\WINDOWS\system32> Nslookup contoso026
Server:  contoso027.contoso.org
Address:  192.168.1.4

Name:    contoso026.contoso.org
Address:  192.168.1.1

PS C:\WINDOWS\system32> Nslookup
Default Server:  contoso027.contoso.org
Address:  192.168.1.4

> set d2

> contoso026

Server:  contoso027.contoso.org
Address:  192.168.1.4

------------
SendRequest(), len 36
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  query, want recursion
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = A, class = IN

------------
------------
Got answer (52 bytes):
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  response, auth. answer, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = A, class = IN
    ANSWERS:
    ->  contoso026.contoso.org
        type = A, class = IN, dlen = 4
        internet address = 192.168.1.1
        ttl = 1200 (20 mins)

------------
------------
SendRequest(), len 36
    HEADER:
        opcode = QUERY, id = 3, rcode = NOERROR
        header flags:  query, want recursion
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = AAAA, class = IN

------------
------------
Got answer (92 bytes):
    HEADER:
        opcode = QUERY, id = 3, rcode = NOERROR
        header flags:  response, auth. answer, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        contoso026.contoso.org, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  contoso.org
        type = SOA, class = IN, dlen = 44
        ttl = 3600 (1 hour)
        primary name server = contoso027.contoso.org
        responsible mail addr = hostmaster.contoso.org
        serial  = 66448
        refresh = 900 (15 mins)
        retry   = 600 (10 mins)
        expire  = 86400 (1 day)
        default TTL = 3600 (1 hour)

------------
Name:    contoso026.contoso.org
Address:  192.168.1.1

>

Answer 4

CandyLuo,

Additional information:

I also tried turning off the firewall on contoso026 (the problematic server) and removing its IPv6, but that didn't help.
After many attempts, I see that sometimes clicking on contoso026 in another host's File Explorer immediately after that other host reboots works at first. Then, if you close File Explorer for a short while and re-enter, you can't access contoso026.
Once you somehow access contoso026 successfully and leave the File Explorer open, you can always re-enter consoto026. But if you close File Explorer, then after a while (maybe 10 mins.?) and re-enter File Explorer and try again, you once again get "network path not found".
nbtstat -a is showing contoso026 as the Master Browser. Maybe this is somehow related?
Reminder: contoso026 is a Hyper-V, and therefore has 2 NICs. Maybe it shouldn't be the Master Browser?

FYI

Answer 5

Anonymous

Reminder: contoso026 is a Hyper-V, and therefore has 2 NICs. Maybe it shouldn't be the Master Browser?

Master Browser should not be multihomed. The problem may be related to this.

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Multiple Attempts Required to Access Host vis NetBIOS Name

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