I upgraded 3 servers on the weekend to 5.1. All working fine. Installed VDP, and setup some backups. It ran a lot of backups all at once of course and was successful.
I return Monday to work to try and log into the VDP via the Vcenter web client and when I click "Connect" it gives me this
Rebooting the VDP server does not fix the issue. I can't get back in.