cannot connect on socket

[SSO Montgomery]

I'm getting a 'cannot connect on socket' error when running a backup.

Here is the error log from RMAN.

RMAN-03022: compiling command: IRESTORE
RMAN-03023: executing command: IRESTORE
RMAN-08016: channel d1: starting datafile backupset restore
RMAN-08502: set_count=155 set_stamp=469114405 creation_time=Aug 05 2002 13:33:25
RMAN-08021: channel d1: restoring controlfile
RMAN-08505: output filename=/u06/oradata/bmm/eric_control01.ctl
RMAN-03026: error recovery releasing channel resources
RMAN-08031: released channel: d1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure during compilation of command
RMAN-03013: command type: restore
RMAN-03007: retryable error occurred during execution of command: IRESTORE
RMAN-07004: unhandled exception during command execution on channel d1
RMAN-10035: exception raised in RPC: ORA-19507: failed to retrieve sequential file, handle="oracf_dBMM_s155_p1_u4rdvc7h5", parms=""
ORA-27029: skgfrtrv: sbtrestore returned error
ORA-19511: sbtrestore: Failed to open for restore.
RMAN-10031: ORA-19624 occurred during call to DBMS_BACKUP_RESTORE.RESTOREBACKUPPIECE