Re-Register to vCenter Server using Update Manager Utility
It is necessary to re-register vCenter Server from Update Manager, for example when you change IP Address, Hostname or Certificate of vCenter Server. When you get an error message like below, then you know that you will need to re-register vCenter Server from Update Manager.
There was an error connection to VMware vSphere Manager
When Update Manager is installed, it installs VMwareUpdateManagerUtility under C:\Program Files (x86)\VMware\Infrastructure\Update Manager folder.