issues using VCBmounter to backup a windows 2008 VM

Hi,

I'm having issues using the vcbmounter command to backup a windows server 2008 R2 Standard VM. I can succesfully backup all our 2003 servers using this command.

Has anyone experienced this? is there something I need to on the OS to allow the VCB Proxy server to take the backups?

vcbMounter -h -u -p -m san -a ipaddr:[IP address of VM] -r -t fullvm

Thanks

Amar