I was recently going through http://steamdb.info when I stumbled upon this article regarding valve's security and how they could possibly add a rewards system encouraging people to find vulnerabilities and report them to valve.
Article: http://steamdb.info/blog/47/
Newly created webpage...
I was messing around one night and found out that had that ability to shutdown any server at will using a server-side command called "sv_shutdown" I went on different source mods like Synergy, Obsidian Conflict, and Team Fortress 2 to test if this really worked. They proved to be successful with...