Problem connecting to VM server through VCenter. (4280544)

Getting error below when trying to connect VMware Vcenter after Windows servers were patched. Severity Alarm Raised Message Snoozed By Snoozed Until
High Monitored Server - VMware Connection Failure 4/22/2013 3:32:40 PM Cannot connect to VMware server 'VCDELL.vm.com' :

The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. 

Microsoft released an update that requires certificates to be 1024-bit encrypted, and by default, certificates on the vCenter servers are 512-bit encrypted:

 http://support.microsoft.com/kb/2661254

Base on above article, the certificates can be re-created on the vCenter server with 1024 bits, you can add a reg hack to the Spotlight diagnostic server that will allow the current 512-bit encrypted certificates to work.  If the diagnostic server is running Windows 2008, you can create the reg hack by starting a command prompt with elevated privileges (run as administrator), and then run the following command:

certutil -setreg chain\minRSAPubKeyBitLength 512

Reboot the server.

Note: IE still cannot not load the vCenter server, so that's not a valid test of success.