Came across an issue today where when I launch the Exchange 2010 EMC I was presented with the error message:
_"The attempt to connect to http://server.domain.com/PowerShell using "Kerberos" authentication failed: connecting to remote server failed with the following error message : The WinRM client cannot complete the operation within the time specified. Check if the machine name is valid and is reachable over the network and firewall exception for Windows Remote Management service is enabled. For more information, see the about_RemoteTroubleshooting Help topic."
Not an error I had seen before so after searching around the Internet for awhile I came across the correct fix for this issue.
1. First Close EMC
2. Navigate to C:usersspecific userAppDataRoamingMicrosoftMMC and delete the Exchange Management Console config file
3. Then within the registry HKCUSoftwareMicrosoftExchangeserverv14AdminToolsNodeStructureSettings delete the value NodeStructureSettings
4. Log off and back on
5. The EMC should now launch fine