Not able to link this.

So I wanted to make a button for the Team Fortress 2 Bombing run, to take people directly to the game, but it says that steam://connect/81.19.209.167:27018 is not a valid link.
 
Also a suggestion that someone posted on another thread, how about a system like a calendar for everyone to know the Giant Bomb events, incluiding the Bombing runs?

Use Insert >> HTML and add something like: 

<a href="steam://connect/81.19.209.167:27018">TF2 Server</a>    

Thank you! done.