If you replaced the nwncdkey.ini file you got from us, everything should work like a charm... Unless you had the misfortune of getting a key that some pirate generated long ago, and got banned.

If you did replace the .ini file, could you ask the NWN server's administrator to check what CDKey the ban was issued for? Assuming they can check it, of course.

If the server's admin can't help, please send me a PM and I'll see what else we can do.