The problem was in fact my server IP. I changed the IP in boot.cfg, and it worked perfectly fine. Thanks for your time!
I downloaded server 5.1 (release), and the torrent file containing the client. I first attempted to download the direct file, but the download was corrupted. As far as accounts go, I created an account for this site but it was my first time trying to log on to LU. I’m guessing the issue is most likely relating to the IP address as I have no idea what I need to do for that.