Assuming I've done this all correctly, the new L4Dforums server is up and running. It's a private, password-protected server, so there's no more hassle with regards to spending 20 minutes waiting to connect to a playable server.

It supports up to 8 players, and is located in the UK, although thanks to Zombie Ponies/Peppermint, we've tested the ping and it's certainly playable for those on the other side of the Atlantic as well.