Online games don't work - Google etc. Already?

After a week, all multiplayer and online games have stopped working (R6S, Fortnite, Minecraft). Already at login it fails. The games are said to be unable to connect to the servers. Google, YouTube etc. Works without any problems. Turn off with firewall, reinstall games, I've already tried it. Vain.

You have to have a look at your router configuration. You can set that only certain protocols are released. Web is just http / https protocol. Most games work over the UDP or TCP protocol.

I didn't get it, could you explain that to me exactly?

Would a LAN connection be an option?