After upgrading to VC 2.0.1 one of my ESX servers disconnected and after trying to reconnect I get the following errors:
Failed to install the VirtualCenter Agent service.
Login failed due to a bad username or password.
Also, I logged in to the ESX server directly and I see the following errors:
A general system error occured: Create upgrade tmp directory failed.
The specified key, name, or identifier already exists.