Was having issues after upgrade to 2.5 u4. "The VMware Update Manager cannot accept requests now because VirtualCenter server cannot be reached, or the database cannot be reached, or it is in the process of stopping" and another error when exiting VI.
1. Unchecked UM client.
2. Uninstalled UM Client
3. Unininstalled UM
4. Ran 2.5 u4 update again. It recognized that everything was installed except Update Manager. Upon reaching the screen to select ports, I am getting an error that HTTP/S are already in use.
I've never used any port #'s other than default.