ok so READ. windows firewall is off. routers firmware is latest version. 2 weeks ago i tried to make a minecraft server for my friends and at first i was having trouble opening the port but then i got it open and the server was up and running fine. so acouple days ago i had to make a server for tekkit. same process of port forwarding. i even did a fac reset on the router. but now when i try and port forward 25565 and click save my internet cuts off. it never did this before and idk why its doing it now. i have cox internet. 100mbps and 10 upload. and i have a belkin router