Microsoft, Active Directory Login issue.

We have 2 AD servers, One in Main Office *(  the other on a 3mb line in a Branch Office ( .   We have replaced the Main Office AD server with a new Server.
All the roles was moved before the old server was demoted. The Main Office server has the Global Catalog.    All of the other servers has and for DNS/WINS in that order.

My issue is when the Main Office AD server is rebooted. No one is able to login to the domain.  I get domain cannot be found.
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Matthew MillersCommented:
You can disable the requirement for a GC to be reachable, but it may be simpler to configure the remote office DC as a GC.

Enable or disable a GC:

How to disable the requirement that a global catalog server be available to validate user logons


In a single-domain forest, configure all domain controllers as global catalog servers. Because every domain controller stores the only domain directory partition in the forest, configuring each domain controller as a global catalog server does not require any additional disk space usage, CPU usage, or replication traffic. In a single-domain forest, all domain controllers act as "virtual global catalog servers" in that they can all respond to any authentication or service request. This special condition for single-domain forests is by design (authentication requests do not require contacting a global catalog server, as they do when there are multiple domains and a user can be a member of a universal group that exists in a different domain). However, only domain controllers that are designated as global catalog servers can respond to global catalog queries on the global catalog port 3268.

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Check the DNS zone on the branch office DNS server.  Is the DNS zone up to date?

or it could be a global catalog issue as mentioned above.  Check the branch office server is configured a global catalog server.
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