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I sent my friend a copy of my current RPG and I changed the client so it would connect to the computer at my house instead of local host. When ever he runs my game console flashes a bunch of errors and closes instantly. I've heard it might be an issue with port-forwarding? How do i know if I have the ports forwarded?
Is your computer behind a firewall? If so, you must allow remote access through that particular port. How to do this is operating system dependent.
What if the server is multi-threaded? Do I have to allow access through all ports?
Do you mean access occurs through several different ports (I'm assuming multi-threading gets factored into the equation because each thread accesses a different port)? Then yes, you need to open up access to all the ports necessary.