If you get this:

The following error occurred while attempting to connect to the specified Exchange server ‘yourdumbservername.nerd.local’:

The attempt to connect to http://yourdumbservername.nerd.local/PowerShell using “Kerberos” authentication failed: Connecting to remote server failed with the following error message : Access is denied. For more information, see the about_Remote_Troubleshooting Help topic.

Check the time on your Exchange server(s) relative to the DCs. In my case, they were very out of sync because a Virtual DC updated its clock to match the host. Make sure everything is in sync, give it a moment, give it a try. I reset IIS on my servers for good measure. Found a lot of messages about this, no good solutions.