I've got a VCB proxy with Backup Exec 12.5 connected to a SAN Fibre-Channel.
The software has always let me to back my VMs up, but now I'm always getting this error:
Error: Failed to open the disk: Cannot access a SAN/iSCSI LUN backing this virtual disk. (Hint: If you are using vcbMounter you can use the option "-m ndb" to switch to network based disk access if this is what you want.) If you were attempting file-level access, stop the vmount Service by typing "net stop vmount2" on a command prompt to force vmount to re-scan for SAN LUNs and re-try the command.
During the process, I see that an snapshot of the VM is taken and I see some files (vmx, nvram....) in the temporary folder I've set in the Backup Proxy. The only files that are not sent are the vmdks.