My server is not starting. What should I check?

Open the Console page and look at the startup logs. Common causes: a corrupt addon or plugin crashing on load, running out of allocated memory, or a misconfigured server.cfg / server.properties. Try removing recently added addons or plugins and restart. If the console shows no output at all, the server may have hit its memory limit; consider upgrading your plan.

For Project Zomboid specifically: if your server was crash-looping shortly after starting, especially right after a reinstall or a plan/memory change, with out-of-memory symptoms in the Console, that has now been resolved platform-wide. Just start your server again. If it still happens, contact support. If your server won't start after removing a Workshop mod, double-check the Workshop Mods page shows it as removed and that you clicked Save Changes; a mod left in the config after removal can stop the server loading cleanly. If players (or you) can connect to the server but immediately get disconnected with "Client version does not match server version", that is a branch mismatch, not a start failure; see the updating guide. If a reinstall does not complete or hangs on the Steam download step, check the Console page for the install log; a repeated failure with the same error is worth sending to support along with the exact text.