Tutorials

Why errno 111 is connection refused and not a password problem, the bind-address and skip-networking traps, opening port 3306, and proving the path before blaming the plugin.

The connect handshake behind 'Connection failed after 4 retries' - UDP reachability, sv_lan, rate/netchan limits, wrong port, and provider-level UDP filtering - each with a concrete test.

Why rcon succeeds from the server box but 'Bad rcon_password' or timeouts hit from outside, how the RCON challenge works, the sv_rcon and firewall settings that block it, and how to test it safely.