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We need to make some modification to our WAN and the network will be down for 2 days between dc1 and dc2. But yes, we will be still connected via a backup route to the domain using dc3.<br />
So dc3+dc2 will be connected to the domain but they will not be able to see dc1....
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Provided all the users and all the servers can see a DC then everything should work tickety boo.<br />
<br />
Do consider moving the FSMO roles before the line goes down. &nbsp;Whilst not essential, if you find you need the functionality of one of the roles after the line has gone down you will need to seize the role which will complicate matters when the line comes back up.<br />
<br />
Cheers,<br />
<br />
Plod
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Unfortunately i can't move the FSMO roles, because dc1 serves as PDC other locations too....
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Ok , as said you would only have problems with new users and users that have changed their password , and would move between your locations and germany. <br />
<br />
A further question, Do you have multiple sites configured in sites and services ? or just one? <br />
If multiple sites , then authentication will always be on the local DC. If one site, clients might want to authenticate to the german dc even although that shoudl mean you have a ineffecient AD setup
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Yes we have multiple sites configured. Each location with his site and a dc in location. We have 2 dcs because we have 2 buildindgs...2km between them.
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Ok so then it should give no worries, <br />
<br />
only people moving between germany and your sites who just reset their password migth experience something. But i guess the changes for that are pretty remote :-)<br />
<br />
Just keep the downtime to the minimum possible, and check replication afterwards by creating a user on your site, and seeing if it replicated to germany for example.<br />
<br />
Happy transfer :-)<br />
<br />
B 
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Also, consider running dcdiag from all the DC's before and after the downtime to ensure any new issues are highlighted (as well as existing issues).<br />
<br />
Plod
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I want to thank you all for your replies....I hope you don't mind if I split the points between all of you :)<br />
<br />
I wish you a Merry Christmas and A Happy New Year...!!!
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<div class="content wysiwyg-content">
Hello,<br />
<br />
I have 2 buildings and 2 domain controllers wich replicates with the primary domain controller in Germany like in the visio drawing.<br />
<br />
My question is, how the users will be affected if the connection between primary domain conttroler DC1 &nbsp;and the DC2 will be stoped for 2 days ?! The users will be allowed to connect to domain and to authentificate to the exchange server and the file servers ?!<br />
<br />
Thanks.<br />
<a href="https://filedb.experts-exchange.com/incoming/2008/12_w50/86162/network.jpg" target="_blank" class="file-inline" title="network (41 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>network.jpg</a>
</div>
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network.jpg

Hello,

I have 2 buildings and 2 domain controllers wich replicates with the primary domain controller in Germany like in the visio drawing.

My question is, how the users will be affected if the connection between primary domain conttroler DC1  and the DC2 will be stoped for 2 days ?! The users will be allowed to connect to domain and to authentificate to the exchange server and the file servers ?!

Thanks.

Domain Controller replication

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).