Getting error when i try to update server in Backup Exec 2012

Im trying to update a server when I get this error.

Utility Job Information
Error connecting to the remote computer.  Ensure that the computer is available, has WMI enabled, and is not blocked by a firewall.24 

Job Completion Status
Job started     : Wednesday, May 15, 2013 8:28:35 AMJob ended       : Wednesday, May 15, 2013 8:28:43 AMFinal error: 0x643 - Fatal error during installation.
Final error category: Other ErrorsCompleted status: Failed

I tryed to reinstall the agent on the server. Firewall is OK, WMI is enabled and running with no errors.