Backup Exec 2012 - ESX Server

Hi 

I have added a ESX Server to backup exec 2012 so I can back up the virtual server itself as a whole. I had backups running and restoring successfully. Since a reboot the creditials are failings anf backups do not work.

The ESX Server passes ok and the ha_datacenter passes ok. Two other win 2008 servers pass ok. The remaining 8 win 2008 servers fail. All use the same login. Nothing has changed.