I was installing Symantec Backup Exec 11d to back up a bunch of servers with Oracle database. After several fruitless sessions to get the Oracle Agent to work, I logged a call to Symantec Support.
The good folks there tried really hard. Change logon accounts, recreate login accounts, checked RMAN, run scripts. Escalated to 2nd level, third level, from India I ended up in the UK! The service engineer did another round of data collection and testing to no success.
On another day, I called up to follow up on the progress. This time I ended up in Australia! Never mind about the bouncing around the world because this eagle-eyed service engineer decided to check the RMAN error against Symantec database and found that the Oracle Agent is broken.
Oracle Recovery Manager (RMAN) backups fail intermittently with error: ORA-19506: failed to create sequential file
The link is here