DC Failover Fail

FNG here....

Why is it that I have 2 DC’s which are failovers of each other, but when I bring DC1 down (which is the master essentially) I have AD problems.  For instance, I just rebooted DC1 because it should have no impact on the network as we have DC2 as the failover DC, and yet I just tried to send an email and my Exchange Server complained back to my Outlook client that it lost connection to DC1.  

Thanks for any ideas on what my problem may be.
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Darius GhassemCommented:
Is DC2 a Global Catalog?

Run dcdiag to check health of DCs.
SSNYTAuthor Commented:
yes it is a global catalog, it points to DC1 and DC1 points to DC2.

health is good, only failures are with advertisement of time and systemlog tests.
Darius GhassemCommented:
Alright what versions of Windows and Exchange are you running?

Time is one issue. If you are failing advertising that means the server is not advertising as a DC.
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SSNYTAuthor Commented:
both are running server 2k3 service pack 2.  

exchange server 2k3 sp2 (6.5.7638.1)

yeah, DC2 failed its test in advertising it was a time server.  that would cause this problem?  it seems totally unrelated.
Darius GhassemCommented:
Failing anything could be the problem.
SSNYTAuthor Commented:
so what would be your recommendation?  demote and promote the dc?
Darius GhassemCommented:
Post the whole dcdiag

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SSNYTAuthor Commented:
thanks, i demoted and promoted.  that seems to have cleared the issue and resolved my problem.
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