I can't join my own server more than once. I get stuck on loading after the intro. Friends can join the server as much as they want. Only by deleting the world I can join again. Vantus explains the situation below: 2. Wait for server to start then launch Project Zomboid (64-bit), enter the correct IP, Port and a Username. Then join. 3. Success!! I'm on my server and playing without issue. (See just how fabulous my character is!) 4. I check the Player List to make sure I'm definitely online. Aah-yup! 5. I decide I don't like being quite so fabulous so I decide to come out of the game. 6. I forgot I left a dead rat in the cooker at Bob and Kates house, so I decide to go back in to stop it! (Without closing, restarting or deleting the server) 7. Unfortunately my days of being fabulous are over because I am unable to get back in. I am presented with a forever loading screen. 8. I alt+tab to check the console and see this: 9. I cry into my Weetabix. So there you have it. I'm sorry I didn't have any of my friends around to occupy the server as back up in my screenshots but I can confirm that while I experience all of the above, they can join and disconnect as frequently as they wish, even with new characters. The only way for me to get back into multiplayer again is to delete the "servertest" folder in my User>Zomboid>Sandbox directory, thus undoing any work we've achieved on that world save. I am then subject to my One-time-connect rule in the new world save. Rinse and repeat. I hope this helps or at least highlights where it is I am going wrong! What I have to add is that I tried hosting the server on a second laptop in my wifi, and joined with laptop-A (using local IP of the second laptop) and got same results. So I don't think this is about using the same machine, but using the same router(?). Some router info: