Made by the ZBlock team, CrashBlock is a lightweight plugin which prevents two commonly known Source server crashing techniques. Simply named "the RCON method" and "connecting command approach". The plugin is designed to provide a stop gap against server crashers in Counter-Strike Source and other old Episode 1 engine games (like HL2MP) whilst zBlock 4.5 is still in development.

This plugin will not be compatible with other plugins which attempt to combat these crash techniques - i.e. zBlock 4.5 Beta or RconLock.

Further we would like to advise server administrators to set strong rcon passwords as there are a few people reporting their server passwords are being discovered by brute-force attacks. For added security you may also set this password through a startup command-line parameter.

You can grab the Server plugin over here.

Alternative for SourceMod servers

People running SourceMod on their servers can, however also use devicenull's RCON Blocker which you can grab over here and works for ALL Source engines including Orange box and L4D engines.