Confirm [webPanel] webPanelEnabled = true in server_config.toml.
Check the server log for the localhost launch URL. Browser auto-open is best-effort only.
Confirm webPanelBindAddress is still 127.0.0.1 and the configured webPanelPort is not already occupied.
If you are running under a hosted panel, leave the web panel disabled and use the stdio host console path instead.
Connection/port problems
Confirm that you forwarded the correct port in serverPort in server_config.toml.
Confirm port in serverPort is open on firewall/NAT.
Check logs for Tugboat startup and that the loopback client connects.
Clients disconnect right after connecting
If authentication is enabled (authProvider is not None), check server logs for auth failure reasons (provider mismatch, nonce mismatch, timeout, or banned player).
Verify authProvider matches your intended mode (SteamGameServer recommended).
If using Steam game server token login, set steamGameServerLogOnAnonymous: false and provide a valid steamGameServerToken.
Keep authAllowLoopbackBypass enabled so the internal loopback host path does not get blocked.