The attempt to connect to http://exchange.contoso.com’/powershell using ‘Kerberos‘ authentication failed: Connecting to the remote server failed with the following error message : WinRM cannot process the request…
Close EMC. Open regedit and delete ‘NodeStructureSetting’ from registry: HKEY_CURRENT_USER\SOFTWARE\Microsoft\ExchangeServer\v14\AdminTools.
Make sure that the Kerbauth module (C:\Program Files\Microsoft\Exchange Server\v14\Bin\kerbauth.dll) is not enabled on the default website but is, instead, enabled only for the PowerShell virtual directory.
Make sure that the WSMan module (C:\Windows\system32\wsmsvc.dll) is registered but not enabled at the Server level.