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Domain Controller not servicing clients in its Site

Posted on 2011-02-28
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Last Modified: 2012-05-11
Hi guys, we have an issue concerning domain controllers that dont seem to authenticate clients that are in its site.

For example,

Site: HO
Domain Controller: AUTESTDC (This is listed as a server in the Site HO in AD Sites and Services)
Client: CLIENTPC
CLIENTPC has an IP address that is part of a subnet that this Site should service, and as listed in AD Sites and Services.

So, the following is what is happening on a regular basis.

CLIENTPC boots up, user logs on.
Instead of AUTESTDC being the %logonserver%, when you issue this command, a domain controller OUTSIDE its own SITE is the logonserver.

What we need to establish is the following:

1.Why is the client continually getting authenticated OUTSIDE its own site?
2.How can we determine the problem with the local DC (if there is a problem) to see WHY it wont be the logonserver.
3.How do we get the local DC AUTESTDC to be the local logonserver.
4.In our AD Sites and Services, the setup looks correct, so we are at a loss to understand why clients are not being authenticated locally.
5.Any test tools that we can use to fix this problem?

Any help on this greatly appreciated.


Simon

netlogon.jpg
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Question by:Simon336697
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Expert Comment

by:Renato Montenegro Rustice
ID: 35002807
First, the message you uploaded is telling you that you have clients whose IP addresses does not match to any subnet created in Active Directory Sites and Services. To find out what IP addresses are involved, take a look in the netlogon.log file. It's located in the following path:

%windir%\debug\netlogon.log

For additional information about net logon logging, take a look at this document:

Enabling debug logging for the Net Logon service
http://support.microsoft.com/kb/109626

By default, you will see enough information concerning the site awareness.

That takes us to the second point. Workstations will choose the domain controllers based on the subnets you associated with sites in Active Directory Sites and Services. Make sure you setup them up correctly, including the appropriate subnet mask. If you need information about how to translate a subnet mask to a /xx format, use a subnet calculator: http://www.subnet-calculator.com

For example, the subnet mask for the ip address 192.168.128.10 with the subnet mask 255.255.255.192 would be 192.168.128.0/26 (the 26 would be in the field Mask Bits of the calculator when you select the mask 255.255.255.192).

Besides, to use site awareness you need at least a fully updated Windows XP or later.

Make sure everything is in place and tell us what you've found.
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Expert Comment

by:Renato Montenegro Rustice
ID: 35002844
Also, make sure your clients are able to reach the domain controller. You can make a connection from the client to make sure:

\\your_desired_dc\netlogon

You can also run a dcdiag /v in the domain controller and send it back to us. If there is something unusual we will be able to tell you how to fix.
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Author Comment

by:Simon336697
ID: 35011195
Thanks so much rmrustice, that is brilliant info.
Ill run the dcdiag and send it back.
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Renato Montenegro Rustice earned 500 total points
ID: 35224630
Any news on that?
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Author Closing Comment

by:Simon336697
ID: 35237811
Thanks rm
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