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What Determines which server is the logon server

Posted on 2009-02-18
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What determines which server is the logon server, i think i maybe having replication problems as sometimes when i do a set l on some of my clients the logon server they are using is a DC on a site miles away and not the local DC
How can i fix this and make sure replication is setup correctly
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Question by:dougdog
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by:tigermatt
ID: 23675953

The first part which is used to determine that is the Active Directory Sites and Services configuration. In a properly configured domain, the Sites and Services should be a configured with a separate site object for each remote office. Each site's subnet should be allocated to the site, so Active Directory can automatically assign machines to that site. Finally, each site's DC(s) should be located within their respective site's 'Servers' container.

Once that is done, you can be sure that all devices on the network know which servers and resources are local to them. They will try to use these where-ever possible, prior to communicating with a DC in a remote site. The actual DC it picks out of its local ones as defined in AD Sites and Services is pretty random, though.

If you don't have multiple domains you'd also want to ensure that all DCs are Global Catalog servers. http://www.petri.co.il/configure_a_new_global_catalog.htm Having a GC in each site can significantly speed up logins, since a GC is required at login time to establish Universal Group Membership.

-Matt
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by:dougdog
ID: 23676060
we have just one domain with multiple domain controllers 2 at headoffice and one at each site
i have a subnet setup for each site, and under inter site transports / IP i have grouped the sites that i want to replicate with each other
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by:tigermatt
ID: 23676093

But do you have separate site objects created? In other words, in AD Sites and Services, do you see a separate container for each separate site you have, and if you view the Properties on those containers, do you see them allocated to their appropriate subnets?

You'll need to verify all DCs are GCs as that can affect the server selected for use during the logon process.

-Matt
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by:dougdog
ID: 23676107
yes i have a seperte site object for each domain
then under inter site transport i have the sites in a site link
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by:tigermatt
ID: 23679186

And what about Global Catalog servers? Are all your DCs also designated as GCs?
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by:dougdog
ID: 23681332
no they were not i am in the process of changing them to be gc
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by:tigermatt
ID: 23681454

That would be where your problem is then. Once all the DCs are promoted to GCs (and they have had sufficient time to build their GC database), you should start to see the local DCs used at login.

-Matt
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by:dougdog
ID: 23682482
i will sort that and let u know thanx
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by:dougdog
ID: 23714722
do i need to configure site links or site link bridges
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by:tigermatt
ID: 23748621

If you have multiple sites, you need to ensure you have created separate sites for each office and configured them properly, including the site links. However, you stated above you already have separate site objects in AD, so it is likely to be the Global Catalog issue which was causing the problem, not the site configuration topology.

-Matt
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by:dougdog
ID: 23750403
No prob thanks for all your help just before I close the post and I know it's another qustion what's the best tools for checking and fixing replication as I think that's now where my problem is as there is a difference in the sysvol
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by:dougdog
ID: 23820789
Any advice
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tigermatt earned 2000 total points
ID: 23820893
You can use repadmin, part of the Server 2003 Support Tools, to troubleshoot SYSVOL and NETLOGON replication issues.

See http://windowsitpro.com/article/articleid/79572/jsi-tip-7394-how-do-i-troubleshoot-missing-sysvol-and-netlogon-shares-on-windows-server-2003-domain-controllers.html for details on how to do this.

The Server 2003 support tools are available from http://www.microsoft.com/downloads/details.aspx?familyid=6EC50B78-8BE1-4E81-B3BE-4E7AC4F0912D.

-Matt
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