I've downloaded the server pack, changed the server properties, etc. I am running the server ('test server') and if I set verify-names to false, I can play via localhost. However, if I try and play on my other computer with the externalurl.txt url, it can't connect. I tried http://www.yougetsignal.com/tools/open-ports/ and it said port 25565 was CLOSED. I thought I'd forwarded it.