Can you guys help me with this? This only happen when I join a server directly using GT lite from server list? Anybody have any idea how to fix this.

I already checked launch option in the STEAM library---->right click on l4d2 games---->properties----->set launch option.but there's nothing on the launch option box.

Please I really need you guys's helps..

Hi deen1998,
This is related to how GT Lite starts your game. It appears that while starting your game GT Lite starts it with the insecure command.You should check GT Lite's settings and if there is an option to specify or edit the launch options then remove the -insecure command.
Else post in the GT Lite Client Forum.
Regards,
RaHBeR