Set will tell you which logon server has handled the clients logon.  Look for 
LOGONSERVER:

There could be something wrong with our local DC.  Run DCDIAG and check the 
event viewer for errors in directory service and DNS.

From: Casey Allen Shobe [mailto:[email protected]]
Sent: Tuesday, March 09, 2010 4:12 PM
To: Vaudo, David
Cc: [email protected]
Subject: Re: [Samba] Active Directory domain controller authentication order

Thanks,

I've found the following, as I only have read-only access to the sites and 
services stuff:
* Our subnet is associated with our site definition.
* Under our site --> Servers, only the local domain controller is listed.

I also googled around and found out about "set l" on the command line, which 
shows our local DC.  But I'm not sure how useful this is, because the VPN 
tunnel has been broken for a couple days and the logins are more recent than 
that.
On Tue, Mar 9, 2010 at 3:38 PM, Vaudo, David 
<[email protected]<mailto:[email protected]>> wrote:
Make sure the subnets in AD Sites and Services are correctly configured.  I 
believe they perform to functions:

1. To control DC replication traffic between sites.
2. To make clients authenticate with local domain controllers first.

Thanks
David

-----Original Message-----
From: [email protected]<mailto:[email protected]> 
[mailto:[email protected]<mailto:[email protected]>] On 
Behalf Of Casey Allen Shobe
Sent: Tuesday, March 09, 2010 3:31 PM
To: [email protected]<mailto:[email protected]>
Subject: [Samba] Active Directory domain controller authentication order

Hello,

I'm curious if anybody knows how to configure the order in which domain
controllers are contacted by clients for authentication purposes and other
such stuff.  I've a situation where it seems that all our Windows computers
are attempting to authenticate off of a remote server before the local one,
which is backwards.  I'm not even certain where to check what they are
actually attempting to authenticate against, but whenever a VPN tunnel we
have to an upstream office breaks, logins and file share browsing and other
stuff slows to a crawl.

Thanks for any hints,
--
Casey Allen Shobe
[email protected]<mailto:[email protected]>
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