After replacing our Exchange Server 2010's Client Access Server (CAS) the Exchange Management Console on our Terminal Server continued to try and connect to the old CAS even though it was cleanly removed from the domain. Because we used a different name for the new CAS server the tools that had cached the old name could never connect and apparently weren't smart enough to go find the new server. This is the error I got:
"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 acnnot 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_Remote_Troubleshooting Help topic."
I never found a key or setting file I could remove to fix it and posted on the
technet forums, eventually getting a working solution. Simply remove the following registry key and your EMC will automatically detect a new CAS and reconnect:
HKCU\Software\Microsoft\ExchangeServer\v14\AdminTools\NodeStructureSettings
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