>I have a problem with a linux server in our DMZ. The backup server must
>communicate with the client through a firewall and I have opened up port
>1501 to the client. However, the server is unable to backup the client
>because the client ain't listening on port 1501, even though it is
>configured to do so. I use the following settings:
>
>dsm.sys:
>servername backup
>        nodename                ftp
>        passwordaccess          generate
>        tcpserveraddress        10.1.0.6
>        schedmode               prompted
>        tcpclientport           1501
>        sessioninitiation       serveronly
...

1501 is the default, anyway.  (You can verify what the client is listening
on via the 'lsof' command or equivalent.)

Note that you are using SESSIONINITiation SERVEROnly, which says that the
server will initiate the session according to the node definition
HLADDRESS and LLADDRESS values.  Check those, and inspect the server
Activity Log for anomalies in attempting sessions with that client.
Use DEFine CLIENTAction to experiment and prove session capability
through the firewall.

   Richard Sims   http://people.bu.edu/rbs