The Neverwinter Nights Client Extender (NWNCX) version 0.2.7 replaces the multiplayer listing abandoned by GameSpy.

Server admins will have to alter their server's hosts file to add a couple of lines.

The same data is used by the nwnlist.com site. NWN2 server admins will want to check this site for a NWNX4 plugin that easily adds their server's data to the listings.

Am I the only one who's getting info about different versions of the server and client? I tried to connect to some servers from the list, but without success.

You have the Polish version of the game, right? You should then download the critical rebuild 1.69 patch for HotU PL. The Polish installer provided by GOG is outdated.

The client extender is definitely the way to go, it fixes all multiplayer issues I had previously.