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How do group policies work?

Posted on 2014-07-24
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Last Modified: 2014-09-09
Can someone give me a link that explains how GPO is applied to machine from DC? I want to know if it cant hit primary DC does it round robin until it gets one it can hit? What determines what order the DC's are contacted? Thanks
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Question by:Thomas N
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by:Rafael
ID: 40217602
Have you tried Group Policy informational guide from Microsoft ? It's good reading and breaks down as you need.
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by:Thomas N
ID: 40217633
I dont have time to read that whole guide. Can you just tell me what happens when a machine logs in to get GPO, it checks its logonserver for policy but what determines where it goes next if the server is busy? Thanks
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Rafael earned 500 total points
ID: 40219977
Well, for policies, if it doesn't get a response from it's logon server, it will try to contact any other DC in the same site (pool) and then the domain as itself, if several DC's exist in the same site it uses a unpublished not quite round robin process to pick one that tends to weigh it with about 70% of the logon going to the first one in the list (top down) and 30% spread out for the others in the site.

If no DC in the same site pool responds then it'll query DNS and randomly selects one from the any DC or the domain regardless of site, tried in that order. Finally, if there are no logon servers then the user is logged in via cached credentials if enabled.

HTH
-Rafael
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