vCenter 5.5 Web Console Fingerprint Mismatch

Issue:

When trying to open a virtual machine's console via the vSphere web client, I was receiving a fingerprint mismatch. 

Cause: There was an existing DNS entry with the same name as the vCenter appliance.

Solution:

The vSphere web console uses DNS to connect back to vCenter.  Ensure there is a DNS entry for your vCenter that matches the hostname of the vCenter server. 

Note: This will be more common with the vCenter appliance, but may also impact vCenter installable.