If you are going to spectate a match please make sure that you are set to spectate before joining the 1v1 server. Remember the 1v1 server only has 2 player spots, so if you join as a player then the players that need to get on and have a match can?t join. Also if a match is in progress and you try to join you will get ?connection failed?. This is because the server is full. Set the spectate option and rejoin to watch, but try to set this before you click connect. If you are one of the people playing in the match just connect as normal.
To set the spectate option choose Options->Player Setup and check the box that says play as spectator.
Please make sure to turn this off before going back to the main server since spectating on the main server is reserved for admin use only.