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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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Top Expert 2012

Commented:
Is DC2 a Global Catalog?

Run dcdiag to check health of DCs.

Author

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.
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Top Expert 2012

Commented:
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.

Author

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.
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Top Expert 2012

Commented:
Failing anything could be the problem.

Author

Commented:
so what would be your recommendation?  demote and promote the dc?
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Top Expert 2012
Commented:
Post the whole dcdiag

Author

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

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