Ensure that Linux OS you have is explicitly tested with BEWS v10.0 :
http://seer.support.veritas.com/docs/264484.htm
If it is explicitly tested, then install latest RALUS agent :
http://support.veritas.com/docs/269804
The Backup Exec Unix Agent on a UNIX/Linux system listens on TCP port 8192 on the UNIX/Linux . Port 8192 must be opened on the UNIX/Linux system to allow communication between it and the media server. The port chosen on the Unix/Linux system is dynamic, but communication starts on incoming TCP port 8192.
http://seer.support.veritas.com/docs/275201.htm