I would check the activity log, to see if you're hitting the session limit.

[RC]

On Thursday, July 02, 2009, at 05:22AM, "Tim Brown" <tbrown AT CENHUD DOT COM> 
wrote:
>Anyone seen these errors before, they occur when runnig RMAN level 0 database 
>backup
>
>07/02/2009 04:35:05 sessSendVerb: Error sending Verb, rc: -50
>07/02/2009 04:35:05 TID<4056> ==> ANU2539E sbtwrite2(): Error - buf pointer is 
>NULL.
>07/02/2009 04:35:05 ANS4994S DP Oracle Win64 ANU0599 TDP for Oracle: (4056): 
>=>() ANU2602E The object \oraclecl0\orcnt\df_691129977_21373_1 was not found 
>on the TSM Server
>
>Tim Brown
>Systems Specialist - Project Leader
>Central Hudson Gas & Electric
>284 South Ave
>Poughkeepsie, NY 12601
>Email: tbrown AT cenhud DOT com <mailto:tbrown AT cenhud DOT com>
>Phone: 845-486-5643
>Fax: 845-486-5921
>Cell: 845-235-4255
>
>
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>