Factorio uses UDP for network communication, which is a "stateless" protocol that can be difficult to troubleshoot due to intervening firewalls. Most commonly it is blocked by a well-meaning ISP rule designed to combat Packet Floods, due to the sudden burst of traffic when transferring map data ...

Does anybody have an idea?

Oh, here's the log file, too. I hope it helps.

Hi everyone,

I have a problem with joining a multiplayer game. This concerns the game version 2.0.73, build 84377 expansion win 64.

A couple of days ago, I joined a friend's multiplayer game. At first, I was not able to join, but then I learned that I had to open port 34197 (and choose UDP). That ...