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RMAN-10038 error

My RMAN connection fails intermittently with error RMAN-10038. The command I used is "rman target sys/xxxx@production catalog rman/xxxx@rman."

My RMAN connection fails intermittently with error RMAN-10038. The command I used is "rman target sys/xxxx@production catalog rman/xxxx@rman." I received this error message:
Recovery Manager: Release 9.2.0.6.0 - Production

Copyright (c) 1995, 2002, Oracle Corporation.  All rights reserved.

connected to target database: XXXX (DBID=2277383331)
connected to recovery catalog database
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00601: fatal error in recovery manager
RMAN-03004: fatal error during execution of command
RMAN-10038: database session for channel default terminated unexpectedly
And sometimes it connects sucessfully.
Recovery Manager: Release 9.2.0.6.0 - Production

Copyright (c) 1995, 2002, Oracle Corporation.  All rights reserved.

connected to target database: XXXX (DBID=2277383331)
connected to recovery catalog database

RMAN> exit
The target database is on 9.2.0.6.11 and the catalog database is on 9.2.0.6.0.
In your RMAN commands, you allocate at least one channel. The communication on this channel has been severed for some reason and RMAN does not like that. This is why you get the RMAN-10038 error. If the channel is a disk unit, then you'll need to verify that you do not have a hardware problem with that disk unit or the disk controller. If the channel is a tape device, look to your tape media manager to see why it is losing communciation with RMAN. Typically, this error is not an RMAN error, but external to RMAN.

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