The game server is currently being hosted at nwn.lotn.info:3121. Or look for it in the "Role Play" section of NWN, server name "Legacy of the North", module name "Legacy of the North".

To play on Legacy of the North, you will need:

• Neverwinter Nights, patched to 1.69, with both the Shadows of Undrentide and Hordes of the Underdark expansions. If you purchased the Neverwinter Nights Platinum or Diamond editons, you already have both these expansion packs. Simply use the in-game update tool to get your game patched up to 1.69.
• CEP2.1. This is the Neverwinter Nights Community Expansion Pack, release 2.1c. You can download it from NWVault, the main repository on the Internet for additional NWN content. The CEP page is http://nwvault.ign.com/cep/. Be sure you get CEP 2.1c, not any of the earlier 2.1 releases!
• Special CEP 2.1c1 corrections: http://www.thundertree.org/filelib/LotN/cep2_top_v21.zip

And that's it! Start Neverwinter Nights, go to Multiplayer, and look in the Role Play section for "Legacy of the North". Log in, create your character, and start having fun!