After 15 seconds of play, everyone stops moving!

[Forcepoint]

Hi,
A few days ago I got a new router, 'cus my old one broke down. First I had a Thomson Speedtouch 510, and now I have a Speedtouch 546. With the old/broke router, I had no problems playing UT3, but with my new one I do. When I enter a online game, I can play for about 15 seconds before everyone just stops moving. I have no idea on what to do... i tried forwarding port 7777 to my pc, but this had no effect.

I have no problems playing CoD4 or Guild Wars online.

What can I do now!?

[Stringer]

This only happens when your connection to the server times out. Might want to check the firewall config a little closer it may be bouncing packets thinking its a DoS attack. Check the logs after the problem occurs.

[Forcepoint]

The log says this:

03 days 23:19:24 (since last boot) FIREWALL icmp check (1 of 5): Protocol: ICMP Src ip: [outside ip] Dst ip: [my ip] Type: Destination Unreachable Code: Port Unreacheable

I've removed the outside Ip and my own ip for security reasons.

The message doesn't say which port is unreachable... what ports does UT3 use??

EDIT: I've disabled the router's firewall, still no luck.

[T@F]

ports 7777 and 7778 just to play online.
Hosting is a different story.

[Forcepoint]

Even when port 7777 and 7778 are forwarded, still no luck.

[Forcepoint]

It only happens when i play (i)CTF...
and guess what? that's my favourite game mode!

[Forcepoint]

any1? really lame that it happens only with (i)CTF... :/

I also tested UT3 on my other computer, and there it had the same problem...