RMAN backup using Netbackup failing after upgrading the database to Oracle 11gR2(11.2.0.3)

I have upgraded a database from Oracle 10.2.0.4 to Oracle 11.2.0.3 on Sun Solaris. The RMAN backup was working fine using Netbackup (version: NetBackup-Solaris10 6.5.5) but it started failing as soon as I upgraded the database to Oracle 11.2.0.3. After doing google search I saw some note about the issue with Netbackup 6.5.4 and Oracle 11gR2 but didn't find anything about the combination of Netbackup 6.5.5 and Oracle 11.2.0.3

Let me know if you have experienced the similar issue and have any recommendations.

Thanks,
Ashoke

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