Usually, up until a point. I have had issues like this on other servers ive made as well. I dont believe it would be a network or P2P problem but rather some mod incompatibility as if i make a modless or limited mod server I can boot it up just fine. This server however had stopped booting up despite the fact that zomboid itself has not updated nor any of the applicable workshop mod items, hence why its confusing why it suddenly stops working despite nothing having seemingly changed. But again I can create or load up other non-dedicated co op servers I host without issue. I am unfortunately not good at discerning what to look for in the console log as to what may be causing the issue.