Server update fix
Dedicated Server Version Mismatch
Current answer
Update and restart the dedicated server until its log version matches the player client. A mismatch commonly makes the server disappear or prevents clients from joining after a hotfix.
Where to compare
The server version appears at the top of its logs; the client version appears in the top-left corner of the game. Compare the complete version, not only the major 0.12 label.
Why this repeats
Dragonwilds Early Access can receive small hotfixes such as 0.12.0.4 or 0.12.0.6. The client may update automatically while a self-hosted server remains old. Make server updates part of the restart routine instead of treating each mismatch as a new network failure.