Help all games from Unity Engine can't connect to the internet

[76561198367792193]

yesterday I tried to play Aragami 2 with my friend, I made a private session, and everything went smoothly. today, i want to play it again but i forgot not to open steam first So the game can't open and a pop up appears like "Steam has not been opened", then I open steam and open the game, while in the game and I open Private session, an error came out with the words "Connection failed please check your Connection status and try again" I've tried every way, Restart pc, reinstall Steam, flush dns, And reinstalling the game all those methods still don't work, after that incident all games that use UnityEngine on my pc can't open private or public sessions to play online, Please help me :'