I’ve also been struggling with my ASA servers lately - and have also gotten this error. I think this one I was eventually able to get through by updating/restarting the instance or doing a rollback until I could find a save that worked. If this is a new map save for you, I’m not sure you have the same option but I just wanted to say - you’re not the only one who’s had this issue of late.
Hi, i have the same problem, since this Weekend. The odds, Server says starting, and i still can Join and Play on my Server . On web gui 0 of 20 Players. But no one Else can Join