In 95% of cases, changing the port number to 26901 and disabling IPv6 solves the issue instantly. The remaining 5% are usually Hyper-V/WSL2 conflicts.
Set it to true . This forces the server to use only IPv4, which is much more reliable for gaming.
Your server console is running, the text is scrolling, but it hangs indefinitely at that specific line. Players trying to connect see "Connecting..." forever, or the server simply never appears in the lobby list.
saveworld shutdown
This avoids file permission issues that cause the "exclusive" lock.
Note: This file is generated automatically by the game. Deleting it while the server is truly offline is safe and forces the server to create a fresh lock on startup.