It turned out to be the vCenter that couldn't take a snapshot of the server.
Solution:
Create a backup of the virtual machine.
In VMware Infrastructure (VI) Client, browse the datastore where the virtual machine is located.
Verify that there i...
Backup Exec 2010 R2 with 4 VMWare servers. I get this error only with one virtual server (Windows Server 2008 STD x32). I checked the credentials and they are valid.