Backup job fails as soon as the firewall is turned on the Linux server

Dear All,

I'm a new to Symantec BackupExec user and I  wounder if some one could help me to fix the problem.

I've followed the complete instructions provided by symantec online documentation. The agent was installed correctly on the Linux server( CentOS) and has been added to the media server( Windows 2008 R2). The browser fails as soon as the firewall is turned on the Linux server, I've configured the IPTables between Linux and Media servers to allow all ports but I'm not sure what is causing the problem.

Any help pl.

Thanks