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Changed Server name and can no longer UNC to computer name

Posted on 2015-01-05
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Last Modified: 2015-01-11
I changed a server to a new name, and I am able to access the shares via Ip address \\123.123.123.123\shares or from the system via \\localhost\shares but I am unable to access it via its name \\servername\shares.   I am able to ping it by name, RDP to it by name, just unable to access the UNC shares by name.  I ran into this on a server 2003 box 10 years or so ago and had to update something in the registry, but I can't find where that was.  This is a 2008 R2 box.  Any idea how I can fix this?
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Question by:digital0g1c
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10 Comments
 
LVL 43

Expert Comment

by:Steve Knight
ID: 40533073
Does it still respond on the "old" name, and it shows correctly in AD with the new name?  

Does it work with \\server.yourdomain.local\shares ?

You get the 'problem' of having to turn off "Strict Name Checking" still in 2008 R2, i.e. when you add a CNAME to DNS or via hosts table entries etc.  That just needs a registry entry "DisableStrictNameChecking" - a DWORD, value 1 at HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters - very useful for adding extra aliases to incoporate old server names when amalgamating etc.

Also what does the output of this command show:

netdom computername servername /enumerate

Steve
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Author Comment

by:digital0g1c
ID: 40533874
On that command, I get the network path was not found twice.  
I didn't add a CNAME, just changed the actual name.  It does show correctly in DNS and in AD.
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Expert Comment

by:Steve Knight
ID: 40533894
Sure.  You replaced "servername" with the server's name?  It should show the names it responds on.

And does it respond to \\server.domain.local if it doesn't to \\server ?
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Expert Comment

by:Tony Massa
ID: 40533972
http://technet.microsoft.com/en-us/library/ff660057(v=ws.10).asp

You're thinking of "Disable Strict Name Checking".  This is generally used when using an ALIAS to a server, but generally isn't necessary if you've renamed the computer.  The IP works because of NTLM authentication, but kerberos is a mutual-authentication scheme.  Your [edit] server may be having issues authenticating with domain controllers (getting a kerberos ticket).  You can use KLIST to check the tickets and maybe you just need to purge the tickets.

http://blogs.technet.com/b/tspring/archive/2014/06/23/viewing-and-purging-cached-kerberos-tickets.aspx

Rebooting does this normally.  You should also be able to view the failed kerberos authentication on the DCs, the server, or the desktop assuming you've enable security logging.
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Author Comment

by:digital0g1c
ID: 40534071
So I was in a bit of hurry and rand the command without changing the name...  when changing the name I get "Access Denied"

I can try rebooting tonight.
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Expert Comment

by:Steve Knight
ID: 40534098
Needs run-as-admin on a command prompt by the sounds of it.  As tmassa99 suggests though there should be event log entries by the bucket load on the client, server and/or dc a the time of the connection.  I just wanted to see what the server thought it was listening on name wise with that command.

Steve
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Author Comment

by:digital0g1c
ID: 40534101
I did the run as administrator.  I first didn't but figured it would need that and did it again.    I will check event logs.
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Accepted Solution

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digital0g1c earned 0 total points
ID: 40534299
Thanks for the input.  The issue was regarding adding the registry key mentioned here http://support.microsoft.com/kb/926642
I added the BackConnectionHostNames Registry entry with the local and FQDN to that key and it worked without a reboot.

I had found this article but skipped it because it references this problem after applying Server 2003 SP1.   But it worked for 2008 R2.
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Expert Comment

by:Steve Knight
ID: 40534409
Bizarre!
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Author Closing Comment

by:digital0g1c
ID: 40542946
The answer was the registry key update
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