tsm oracle 的备份报错 tcp/ip

我的 oracle 备份的时候报错，大家帮忙看看：

channel ORA_SBT_TAPE_1: starting piece 1 at 2011-08-05:20:01:49
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup plus archivelog command at 08/05/2011 20:28:15
ORA-19502: write error on file "1vmj8lpd_1_1", blockno 89089 (blocksize=512)
ORA-27030: skgfwrt: sbtwrite2 returned error
ORA-19511: Error received from media manager layer, error text:
   ANS1017E (RC-50)  Session rejected: TCP/IP connection failure

Recovery Manager complete.