|This may help to do this. If you have a router, try to put your computer in the DMZ settings of it. First you have to assign your computer a static IP, then put that IP in the DMZ screen of your router. Putting your computer in the DMZ setting of your router will allow all ports to be opened in your computer, which may be the cause of this problem. If you need more assistance in Putting your computer in the DMZ setting of your router, just PM me, I would be more than happy to help!|
Hope this helped!
I run Ubuntu 9.04 on my Compaq Presario R3000. I also run windows XP & 7(beta) in virtual box.