Noone can join to my L4D2 server.

[GoliBroda]

Hello, i made server with Srcds downloaded trough SteamCMD.
I have ports forwarded etc.
im new with srcds so i dont how well I am doing, i making server i just typing in srcds console map c1m4 syrvival after start.

1. I cant join my server, when i trying it shows: session is no longer available, if im joining trough console i cant invite players etc.
2. My friends from steam group cant join too.
3. when im starting srcds steam thinks im playning L4D2.