GC authentication problem

[techie211]

hey ppl, I have an issue at one of my schools. I have the domain controller located at the HS and GC at all the other schools for quicker authentication. We has a GC turned off at one of the elementary schools over the summer. It was still down when school started and now when I bring it back up users can't logon..?? and when they run outlook to check their mail they get a prompt for their username and password to connect to the exchange server which they never got. If I shutdown the GC server at that location the users can logon and access their email with no problem. What do you think went bad on the GC server? any help on this is appreciated.