Ezt találtam, és megoldotta midhárom problémámat. Gondoltam beteszem ide is, hogy ha kell valakinek.
"Q4: MSN Messanger is not working properly. I can´t send files, use video or voice chat
You need to enable port forwarding on your router and forward the necessary ports to your computer.
You will need a fixed IP in that computer for this to work (automatic IP configuration won´t work).
1. Go to the router configuration page. Open the Firewall/Port Forwarding page
2. Select Enable port forwarding
3. Map the following ports to your computer IP
Port Range Protocol Comment
1863 Both For Server Connection
6891-6900 Both For File Transfers
3389 Both For Remote Assistance
1503 Both For Whiteboard and other applications
5004-65535 UDP For Video and Audio Conferencing
Note that the port range used for Video is very broad. This is because MSN Messenger uses dynamic ports. This can be a little insecure as your PC will accept any incoming traffic to this ports. Be sure to have all the windows updates, internet explorer updates and service packs to prevent any security hole."