Error Opening EMC in Exchange 2010

Error Opening EMC in Exchange 2010

This post is a note to self to remember this the next time I encounter a similar problem. Article first published: http://telnet25.wordpress.com/2010/02/22/an-error-caused-a-change-in-the-current-set-of-domain-controllers-it-was-running-command-get-federationtrust/ Problem: Receiving following error on Exchange 2010 server after opening EMC and expending Mailbox tab under organization configuration. An error caused a change in the current set of domain controllers. It was running command ‘Get-FederationTrust”

Possible causes:
To be honest first thing I checked was to make sure Exchange server is able to talk to all domain controllers as its configured on its TCP/IP properties.Also as always check to see anything catches your attention under application logs. Fair enough I was able to locate the event log “2080” MsExchangeADAccess” was showing me one DC only, however the TCP/IP stack was configured to talk to secondary DC.

Make sure Exchange is able to talk to all DC’s within its “Site”. Above example the second DC was not even discovered by MSExchange AD access, due to replication problems existed among the DC’s in the  site where exchange is residing. After fixing the relocation issues and restarting MSExchangeADTopology service took care of the error.
Note:
Some other people who had same error assumed to fix this issue by deleting the local profile ( corrupted profile) for the user account they logged into Exchange server. So if the above solution does not work, try this:
This error is actually a false error, and is caused by GUI caching, more specifically MMC caching. This occurs when a DC (domain controller) that is either unreachable or has changed in some way is still cached by the MMC applet. To fix this issue by removing the cache and basically resetting the MMC applet do this:
 Delete this file: “c:\users\<specific user>\appdata\roaming\microsoft\mmc\Exchange Management Console“

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