Well, Consider this scenario where you have an Exchange server, couple of DCs and you want to remove one of them to replace with a new HW, you install the domain controller works normally and then you shut down the old DC, but Exchange keeps connecting to the old DC.
if you have a single DC you might get a warning message regarding Ad topology service cannot connecto to available domain controllers, how to debug that.
First run DCDiag to validate your DC, netdiag if you are running 2003.
make sure that domain controllers can replicate correctly with each other.
Validate the Exchange topology service is discovering the new DC, restart the service and there will be an event listing discovered domain controller.
run setup.com /preparedomain to republish the permissions and ACL and try again.
Monday, May 10, 2010
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