Multiple people online failed

[two_aunt]

There is no mod, the game is the latest version.

But the browser can't get the delay of the room, it displays "---"
If you click Add, it will be displayed that the phase has been closed and an error occurred when connecting the phases.

I suspect that it is a network problem. What servers or domain IP addresses and ports, or which links, are required for ETS 2 to be online?

This problem has only recently arisen. It has always been normal before

[two_aunt]

Okay, I got the answer

Hosts -> Add Rule【partner.steamgames.com】

My DNS provider incorrectly resolved the service address of steam, causing me to not use it normally.