1. Open Console (may have to join a server/create one to then access console; to enable console, go to options, controls, advanced, enable).
2. Copy/Paste:
connect 74.91.113.131:27015 - Primary (Offline for Linux Testing)
connect 74.91.113.131:27016 - Custom Content
connect 74.91.113.131:27017 - Primary 2 (Offline for Linux Testing)
connect 74.91.113.35:27016 - Linux One Round Test Server
3. Even if server says it's full, you will be able to connect to it. Your reserved slot will NOT work if server says it's full and you try to enter via the server browser.
-The Cha0s Team