DC++ server/network

Hi everyone

I have a problem with my DC++ Server (midi.dc.x-nett.com)

The server had beed working fine for over a week and suddenly just stopped working..
It runs on a dedicated PC with windows XP, Updated with Service pack 1.

Well i use Yhub for the DC server ( If that matters).

I have no idea what the problem is, i/other people cant connect to it any longer.
Noone has touched the server.
The internet works fine, but i also run a DC client on it to download and it seems like it stopped workign aswell..

This has happend 2 times. The first time i got it to work by simply changing the Workgroup to the same as the PC i work on, and removing the integrated XP firewall.
And the next day, boom , same thing.. But this time it doesnt work to change workgroup to anything and the XP firewall is off ( it does not work with it on eighter )

The ports on the router are forwarded to the correct network ip ( i checked ).
The IP forwarding to midi.dc.x-nett.com is also the correct one..
Anyone got an idea?
In a hurry