Explanation: On a request to change a shared drive's status, an attempt to establish a connection to the drive's scan host failed.
Determine which host serve as the drive's scan host: use vmoprcmd output or by checking the Device Monitor in the Administration Console.
Ensure that vmd (the NetBackup Volume Manager daemon on UNIX and Linux or NetBackup Volume Manager service on Windows) is running on the scan host. On the scan host, examine debug logs and system logs for any messages that are related to the error.
Examine command output, debug logs, and system logs for a more detailed message on the error.
The detailed reason for the canceled request should be available in the daemon debug logs on the scan host. Correct the problem and submit the request again if needed.