I have firewall software but already 'allow' the exe to go online. Otherwise i wont able to setup server & the my server will not show up in server list in the first place.Most games require you to open ports to get mp functioning, at least every one i have played....
Anyhow, you don't have any firewall running, have you (software that is) ?
Are you saying if i create this server from computer "A" i can only book & join the server from computer "B" ??Host it on a different machine..