Multiplayer Shootout not finding sessions

It is not only the Shootout example, but ALL projects (using all engine versions from 4.16) do not find sessions anymore, the server list is just always empty. Ca. 3 months ago, they definitely did.
Deinstalling and reinstalling 4.19 didn’t help.

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks