We are having a problem that points to matchmaker. Although our dedicated server appears in the server list, no one is able to join. It was fine Sat Feb 27 (USA) night up to at least 23:30 PST (07:30 UTC). The first report of it not working came at about Sun Feb 28 15:45 PST (23:45 UTC). We had to cancel our championship finale because no one could join. Joining other servers is trial and error because it's impossible to know which cars and track are in use before attempting to join but I was able to join two other servers with no issues and one reported the same error. I tried deleting the player and multiplayer JSONs, deleted all of the RFMODs and made and tried new ones, ran the rF2 updater (nothing to update) and ran Steam.CMD but there was no indication of an update.
Solved. https://forum.studio-397.com/index.php?threads/multiplayer-fail-starting-feb-28.69082/#post-1062060 Sorry for superfluous thread, I was expecting that I could delete it before any replies.