Connection to Steam lost Exiting -HELP-

[xpupx]

I know other people are having this problem but I have not found a solution for it yet!
I am unable to create missions because when I go to test them in multiplayer I get the following:
Connection to Steam lost Exiting
Server failed to connect to steam
Firstly I never had this problem until the last steam COD patch of maybe it was a Steam update that caused the problem not sure!.
Secondly it is unlikely to be hardware specific as I have just replaced my Main board recently and still have the same problem !
And yes i have all the latest drivers and windows updates.
Any help would be much appreciated.
Regards
xpupx

[FG28_Kodiak]

Normaly you get this message, if STEAM is in offline mode, do you check this?

[xpupx]

yes all good on the steam front, and router and filters and firewall and antivirus, waiting and an answer from steam/Valve now....

[Ataros]

All ports mentioned in the Steam FAQ open?

Can you host in a Lobby section instead of Server section? Lobby is for those behind a router (if ports are not forwarded I assume).

[xpupx]

Originally Posted by Ataros

All ports mentioned in the Steam FAQ open?

Can you host in a Lobby section instead of Server section? Lobby is for those behind a router (if ports are not forwarded I assume).

All firwalls are off hardware and software, Same thing happens in the lobby!
like i said, it just started after an update/patch still waiting on a reply from steam/valve...

[HomerMix]

I have the same problem and went through the whole troubleshooting with steam Tech support without any results.
They finally told me that they can't do anything and that I have to ask the 1C tech support for help.

steam tech support roughly told me this:
Do a selective startup
Disable firewall
Disable AV
Uninstall AV
Reset Steam to Default settings by clearing it.

None of these was a solution.