Here's a weird one. I have VMware Server Essentials 5.5 with 3 ESXi servers and 1 vCenter Server.
If I use the vSphere client to log into the servers with username and password, everything works just peachy.
If I try to log in to the vCenter web client, the same credentials fail. I've tried logging directly into the machine with our admin account as well as the default VMware username:root, password:vmware.
Any suggestions?