Valve has released an update to the L4D demo to fix the connection problems players have been experiencing since yesterday’s patch.
Updates to Left 4 Dead Demo have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Left 4 Dead Demo
– Fixed problem with users not being able to connect to dedicated servers
– Fix a bug with the group browser not always showing the list of group servers
– Fixed a bug with the rcon command
Hope it works!

