blackstonekeep.com

As I found, there is (maybe already fixed) issue with game server registration and very often it is not available in list to choice.

But, in fact, server is available and work properly by direct connection. It would be good to have officiall information on forum (server's info topic) about current IP address and port to prepare direct connection.

Current server's info - 134.209.217.32:5121

You don't need to keep track of the IP (since that can vary over time). Just write "Blackstonekeep.com" instead of IP in Direct connect.

Also, this is a nice way to make a shortcut on your desktop that direct connects to Blackstone:

https://nwn.fandom.com/wiki/Desktop_shortcut

As far as I can tell, it works with Steam as well. Although I haven't tested it properly, but I made a shortcut and I can use it to connect to the server. I'm not sure if this solution will survive an upgrade of either steam or NWN, but it's easy to remake the shortcut if it stops working.