Sorry, i don't understand the wording of your question.
OK sorry :'(
"why one should all the firewall rules" i forgat the word delete. so it should say "why one should delete all the firewall rules". I thought that was not nessesary. And indeed it was'nt. I didn't have the forwarding rule for the passive ports :-. Everything works fine now.
Thanks for the help.
Rgds,
Hellsblade