I have been facing a problem (Which I never faced before) while mounting local VM manually since last Monday. Before it, everything was working fine for me. This problem started from Monday. I am unable to nail down this problem. Vcbmounter is getting failed to mount any Local VM with bellow error: (Error will remain same for all the local VMs)

vcbMounter -h <IP address> -u root -p <pwd> -a ipaddr:x.x.x.x -r c:\xyz\123 -t "file" -m "nbd"

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2008-06-26 11:10:30.849 'vcbMounter' 3956 error Error: Error while opening disk vpxa-nfc://datastore1 Win-2K3-Test3i/Win-2K3-Test3i-000001.vmdk@x.x.x.x 7:902!52 81 4c fe 1e 90 09 28-ca 40 18 ab 21 ff 1f ab: A virtual disk could not be opened. -- Cannot open disk file: Error : Disk library failed (NBD_ERR_GENERIC). Unable to open 'vpxa-nfc://datastore1 Win-2K3-Test3i/Win-2K3-Test3i-000001.vmdk@x.x.x.x:902!52 81 4c fe 1e 90 09 28-ca 40 18 ab 21 ff 1f ab'. Failed to configure disk scsi0:0.
2008-06-26 11:10:30.849 'vcbMounter' 3956 error An error occurred, cleaning up
...
Deleted directory c:\xyz\123

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It does not seem problem with Proxy server and VCB Framework since I am able to mount iSCSI VM successfully.
It does not seem problem with ESX servers since I used all our ESX server VMs to mount manually. Also I can mount iSCSI VMs successfully which resides on those ESX only.
It does not seem problem with VMs since so far I have tried same thing with different 7 Local VMs. For all Vcbmounter is getting failed to mount with same error. So we can’t say it is VM specific problem.

Could you please share your ideas to rectify this problem?

I use ESX 3.5 (no updates installed yet) and VCB 1.1