When you try to open the Exchange 2010 Management Console, you may receive an error:

The attempt to connect to http://xxxxx.domain.local/Powershell user ‘Kerberos’ authentication failed: Connecting to remote server failed with the following error message: The WS-Management service cannot process the request. The system load quota of 1000 requests per 2 seconds has been exceeded. Send future requests at a slower rate or raise the quota for this user. The next request from this user will not be approved for at least X milliseconds.

The screen looks like this:

Error message

Open an elevated prompt (as administrator) and execute IISRESET .