I decided to host my own Left 4 Dead 2 dedicated server. No mods were installed in the server.
To connect to the server you need to start a lobby up and enter this command in the console
mm_dedicated_force_servers l4d2mad.servegame.com
Server FeaturesTank Rush add on (This has to be asked to be turned on. If you want to try Tank rush just ask and I will set it up for you.)
Server bugsNo weapons on first level (This happens random at times and only on the first level. I been trying to find a way to fix it.)
If you find anything wrong with the server or you find someone being abusive on the server let me know so I can deal with it.