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User logging on against wrong DC

Posted on 2014-09-09
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Last Modified: 2014-09-12
Hi all,

2003 domain running 2003/2008/2012 servers.

I have recently demoted a 2008 DC and replaced with a 2012 on a number of sites. All looks good apart from a particular user seems to authenticate against a DC on another site across the WAN and not the new local DC that is available?

This causes issues with group policy applying properly. But im not sure why the machine is doing this? has anyone seen this before?
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Question by:Matt
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Dan McFadden earned 500 total points
ID: 40311572
I would first run the following commands from the computer the user is working on:

1. nltest /DSGETDC:<YouDomainNameHere.Extension>

2. nslookup
2a. set type=SRV
2b. _ldap._tcp.<SiteName>._sites.dc._msdcs.<YourDomain.Ext>

#1 will tell you what DC & Site this computer/user is connecting thru.
#2 will tell you what LDAP servers are in DNS for the site

I would also verify the TCP/IP configuration on the computer. I would read thru this article and double check your Sites & Services config.

http://blogs.dirteam.com/blogs/paulbergson/archive/2010/04/19/ad-clients-not-authenticating-to-its-local-site.aspx

Dan
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Expert Comment

by:RK
ID: 40311760
Hi,

As Dan said, this type of behaviour occurs due to missing SRV records. If the restart the netlogon service on the appropriate server, the SRV records creates automatically if it is missing.
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Expert Comment

by:Pramod Ubhe
ID: 40312392
set logonserver command will give you the name of DC that completed authentication request for that computer.
additionally check if that computer has a diff IP address which might belong to a diff. subnet. which then you can verify in AD sites and services about the DC where that subnet is mapped.
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