Before you accuse me of not port-forwarding, I have. And, before you accuse me of using my internal IP, I gave my friend the external IP.
My friend can connect fine. However, when I try to join it says "can't resolve hostname." I am trying to play on the server computer itself; I know this is not recommended, but it is a powerful PC and only needs to host 2 people. So, why can my friend connect, but I can't connect even though I am local..