Backups to SmartDisk fail. NetVault reports "Transfer to the device has stalled" and SmartDisk reports "CAFEPROC Failed to create Unix domain steam socket" to the console and in superserver trace.
Failure to create a tmp file as part of a socket open call.
Check tmp directory permissions especially /tmp, /var/tmp. The smartdisk non-privilledged user needs to be able to write to these locations.