As the title states, today, Rigs of Rods's main website/forum (http://www.rigsofrods.com/) went completely offline. This means the multiplayer option in the configurator no longer works for tonight. Luckily, there is a GitHub site that still has the source code and the mp list still intact. If anyone is to play mp, I recommend using this site: https://github.com/RigsOfRods/rigs-of-rods/issues/795
*STATUS EDIT*: After a few hours watching replies, the site is coming back tomorrow and over the course of 31 or so days, all of the information from the original server will be migrated into a new one, so no one should be panicking anymore about this.