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unable to access a server from 2008R2 using by netbios name

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unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:21 pm

We have a Terminal server (Windows Server 2008R2) When we try to connect to the shared folder using the netbios name, it didn't work. It worked when we used the fqdn name. Strangely, this happen only once in awhile. Anyone know why this happened and how to fix this issue for good?

We are able to access other servers bij netbios names. The server that we aren't able to access isn't always the same server. We have this problem on multiple servers.

The servers have the same thing in common:

The servers are virtual and running on a Windows Server 2008 R2 Hyper V servers.

They are Windows Server 2008 R2 with terminal services installed.

When we restart the Workstation service everything is working again.

When we add the name in the host file it's still not working.

Please let me know if you need more information. Any suggest are welcome.
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Re: unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:21 pm

Please make sure that NetBIOS over TCP/IP is enabled.

Also, make sure that the DNS suffix search list is well configured and that there is no firewall /router blocking the NetBIOS traffic.
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Re: unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:22 pm

When the proble occurs:

1. Ping the Server's NETBIOS name.

2. If is responds, is the IP address the correct one for the server?

3. If it times out, what's the IP address it's trying to reach?

When the problem occurs, you can access the shared folder using the FQDN without having to restart the workstation service. Is that right?

After the problem occurs, tombstone the WINS records and try again. What is the result?

Consider turning OFF WINS server. WINS is a thing of the past.

Also, the shared folder is is on a server with a static IP, right?

Also, there are no name conflicts on the network, right?

When the problem occurs, what happens if you flush the resolver cache and try again?

When you ping the server name, here's what Windows does*:

1. Checks it is own name.
2. Checks the cache.
3. Checks the HOSTS file
4. Suffix the Suffix configured on the machine, then query DNS again
5. Check WINS
6. Broadcast
7. LMHOSTS

* I took this list from a blog post by Ace Fekay. Thanks, Ace!
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Re: unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:22 pm

We can ping by netbios name, thats no problem. It returns the correct ip adres

We can indeed access the server shares bij FQDN, so you're correct about that.

Tombstone the WINS records doesn't make any differents. Remember that we just turned WINS on after the problem occurs. So WINS turning of is also not the issue.

The servers ip adres are indeed static. And I know for sure that there are no name conflicts.

We have flushed the Servers dns cache and the local DNS cache. Both doesn't make any difference

We have also set the server netbios name in the host file. even this doesn't make any differnce.

So it doesn't look like a dns problem. When we access the share we are using the SMB protocol. I think the problem is some in there.

Please let me know if you have any more ideas!
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Re: unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:22 pm

Can you telnet on port 445 to the server when the problem occurs from the TS? How about from another WS on the network thats not the TS?

Do you have IDS firewall? Can you check your firewall logs?

Have you checked both the TS and the File server logs for errors during the time this problem occurs?



Miguel


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Re: unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:22 pm

What’s the particular system prompt when access remote server via netbios name? please post the error ID and message here.

Have you deployed any third party networking or security software on your servers ? like AntiVirus or AntiMalware software.



If it works with access shared folder via FQDN and IP address , I suspect that name resolution is the cause of this issue, you may start troubleshooting with the mentions in the links below :



How To Diagnose and Test TCP/IP or NetBIOS Network Connections in Windows 2000

http://support.microsoft.com/kb/300986



Troubleshooting networks without NetMon

http://blogs.technet.com/b/askds/archiv ... etmon.aspx



Meanwhile, you could also trying restart TCP/IP settings with following the article below on this terminal server:



How to reset Internet Protocol (TCP/IP)

http://support.microsoft.com/kb/299357



Thanks.



Tiger Li


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Re: unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:23 pm

I've contacted Microsoft. There are some hot fixes availible.



As just discussed please install the below hotfixes for your W2K8 R2 machine. You can download these via http://support.microsoft.com/kb/<number> where you use the below numbers.

If you are downloading them using another OS you might need to select manually that you want the Windows 7/Windows 2008 R2 x64 version of this hotfix. If you download them from the target OS it will show the correct version to download.

<number> - component to update
2444558 for Mrxsmb10.sys
982860 for Mrxsmb20.sys and Mrxsmb.sys
2383928 for Win32k.sys
2398906 - kernel files

As some of the components were also updated via security updates it is possible that you receive the message that one or more hotfixes were not applicable to your system. Please let me know if that happens and for which hotfixes

After installation of the hotfixes you need to reboot the system.

Please let me know if you have any questions or issues,

We have installed these hot fixes and are monitoring the system know.
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Re: unable to access a server from 2008R2 using by netbios name

Postby guest » Fri May 11, 2012 3:23 pm

We are experiencing the exact same problems but only on the server itself. After restarting the TCP/ip Netbios Helper it starts working again. I've allready made an article elsewhere on the forum see http://social.technet.microsoft.com/For ... 9c77b54e0a

But I am very curious if the solutions work out as you say. We have disabled SMB 2 in the registry as this is required by the dental application we are using. So we've found the following http://support.microsoft.com/kb/2194664 as that might have been our problem.

Hope to hear from you if the solution works.
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