GV- or Battlecom-Server with SuSEfirewall2

Hi everybody, have someone running a GV- or Battlecom-Server behind a firewallbox with SuSEfirewall2 on SuSE 7.3? I have forward the packets to the server behind the fwbox , but no packets reach this server an there are no entries in the firewall.log. any hints ? have a nice day kind regards freddy