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Autodiscover error message issue exchange 2010

Posted on 2013-06-19
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Last Modified: 2013-06-26
Need help on understanding why our users keeps getting the autodiscover cert error every time our Domain Controller goes down.

Currently we are trying to upgrade our Domain Controller. We have two, every time we shutdown our First DC, users the error message right away.  I would think autodiscover would use the Second DC when the first DC is shutdown.

Do i have something configured wrong on the exchange/

thanks for any help.
exchangerror.jpg
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Question by:sirichaiphumirat
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by:Stelian Stan
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Do you have that certificate under Local Computer > Personal > Certificates ?
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by:Simon Butler (Sembee)
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You need to look at the certificate prompt to see where it is coming from. Without that it is hard to say.
Autodiscover queries the domain for certain information. If that query fails for whatever reason then it will use DNS queries to find the Autodiscover content.

Clients do not immediately failover to another domain controller. If you are removing/rebooting the domain controller then you will get errors. It is something that should be done out of hours. Exchange works in the same way - it doesn't go looking for another DC for up to 30 minutes in my experience, so taking its DC away can mean Exchange is effectively dead.

Simon.
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