You updated your game client to Alpha 21.2, but your server is still running Alpha 21.1 (or vice versa). The Symptom: The console shows "Initializing" then silently crashes or hangs because the network protocols between client and server are incompatible. The Fix:
Sometimes, the "7 Days to Die server stuck initializing" error is due to a bug introduced in the latest "Experimental" build. If you have tried everything above and it still hangs, . 7 days to die server stuck initializing
The most common reason a server hangs during initialization is a lack of RAM. If you are hosting the server on the same PC you are playing on, you are splitting your physical RAM between the client, the server, and the operating system. You updated your game client to Alpha 21