Yes,

the version of VDDK I have tried before was VMware-vix-disklib-5.1.1-1042608.i386; now I have downgraded the version to VMware-vix-disklib-5.1.0-774844.i386 and the backup was succesfully executed.

Thanks for your help!

Best regards,

Pino Villano

Hello,

I've got same issue.

I can't backup a Win2008 VM in a Esxi 5.1 environment (Migration from a esxi 4.0..)
.....
Backup: 130615_084302
No existing temporary snapshots found.
Temporary Snapshot: vBackup-TMP-130615_084302 e Unable to encrypt password file. Il criterio di recupero configurato per questo sistema contiene un certificato di recupero non valido.
i Password file successfully deleted, but was left unencrypted during job execution (due to above error).
E Unable to complete backup. Unable to verify successful transfer of virtual machine virtual disk file S:\THINWARE BACKUP\CRPV DC\130615_084302\CRPV DC.vmdk.
i Connection to server timed out during backup process (this is not an error).
Connection to host reestablished successfully.
Temporary snapshot removed.
Backup data folder deleted in cleaning up after job failure.
Process Completed: 15/06/2013 9.44.05
Elapsed Time: 1 hour, 1 minute and 16 seconds
......

Reading this post, last Friday I unistalled/reinstalled VMWare Virtual Disk Management Kit with version 5.1.0.774844 with non success..

How can I workaround this issue?