NDMP Backup Fails with "NDMP_MOVER_HALT_CONNECT_CLOSED" Reason 1 (4047906)

The main error in the failing NDMP backup job was "Data operation halted due to unrecoverable internal NDMP server error" followed by "Media had transfer aborted"

Following errors were found in the logs:

Error 2011/10/11 10:01:09 138 Data Plugin ADBACKUP2 Data operation halted due to unrecoverable internal NDMP server error
Error 2011/10/11 10:01:09 138 Media ADBACKUP2 ADBACKUP2 2-0.8.0 (HP Ultrium 5-SCSI): had transfer aborted

Additional error detail seen when clicking on the "!" button of the log entry above:
--> DEVMOVER:02724 658 0 170109 oPost is a 'NDMP_NOTIFY_MOVER_HALTED_POST'
--> DEVMOVER:02724 659 0 170109 Reason = 1
--> DEVMOVER:02724 661 0 170109 Handled reason = 1

HALT REASON: NDMP_MOVER_HALT_CONNECT_CLOSED = 1
NDMP_MOVER_HALT_CONNECT_CLOSED = The mover's connection to the Data Server was closed.