SQL backup are failing with error 23 (socket read failed )

Hi All,

File system backup are working fine but SQL backups are failing with error code 23 socket read failed .

Things i already checked:

1.I checked SQL server and netbackup client services.

2. registry entries.

pls provide me  a solution.

job detail:

02/11/2015 21:39:05 - Error bpbrm (pid=1690) bpcd on <server name> exited with status 23: socket read failed
02/11/2015 21:44:09 - Error bpbrm (pid=1690) cannot send mail because BPCD on <server name> exited with status 23: socket read failed
02/11/2015 21:44:09 - Info bpbkar (pid=0) done. status: 23: socket read failed
02/11/2015 21:44:09 - end writing
socket read failed  (23)