NetWorker backup from DMZ clients very slow

Hi folks,

I have a seperate NetWorker datazone for backing up Clients residing in a DMZ. I have configured NetWorker to use the port range 7937-7990 which works. But the backups are very slow. For example 50 MB of Oracle Archivelogs takes 20 minutes to get backed up.

I now tried to open the whole NetWorker port range (7937-9936) to test if the backups run faster which is unfortunately not the case. I have no idea what the Performance issues causes.

The NetWorker Server and a DataDomain are on the same Network subnet and the Connection into the DMZ is done through a Cisco PaloAlto Firewall. Can the firewall be the Performance killer? Everything is cabled within a 1 GbE Network.

Can I get some Information from NetWorker what he is doing during the backup? Maybe strace a process or something?

Cheers

JJ