Getting disconnected all the time on Lazarus Project

[Ksarish]

Hi there,

I got a problem, I played before on P1999 and never had any problems connecting to the server. (Titanium Client)
But I've tryed Project Lazarus recently (ROF2 client), and I get some serious connection problems, I can log in, but when I get in game, I get disconnected just 10s after, this happen when I'm playing on my DSL connection, but when I switch to my mobile phone connection this problem disapear.
I tried turning off IPV6, but it get me to the character selection menu and get kicked when I try to enter the server.

If anyone have a clue for this.