Need help with C# Sockets - Connection is working locally, but not from another network?

If your friend connects to the Net through a router, the router is almost certainly blocking all unsolicited incoming traffic. That is how NAT routers work.

If your friend connects to the Net through a router, the router is almost certainly blocking all unsolicited incoming traffic. That is how NAT routers work. To get the router to accept incoming connections to a given port and pass them on to one of the machines attached to the router, your friend will have to set up port forwarding.

This site provides instructions on how to do this and covers a large number of router manufacturers and models.

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