At my day job I occasionally do some IT administration, and today one of my company’s clients needed some e-mail addresses reassigned through our Exchange Management Console. Immediately on logging in, I was greeted with an error message.
“The attempt to connect to [redacted] 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_Remote_Troubleshooting Help topic.”
Fortunately, my co-worker had already solved this problem: it’s a stuck registry key. Deleting HKCU\Software\Microsoft\ExchangeServer\v14\AdminTools\NodeStructureSettings will force it to re-detect the server settings and allow it to work properly.
RETROVOLTAGE 
The link “click here to retry” under the error does the same thing as deleting that registry key.
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Exact same error, but I don’t have that Registry entry…