For our project we are using Steam as OnlineSubSystem. The connection to the listen server can be established. When ServerTravel is called on the server side, however, the clients lose the connection after about 20 seconds. During this time, our loading screen is shown as it should be.
This error does not occour, when testing with multiple instances of standalone game in the editor. There everything works (except this other issue). The Steam Overlay does not appear within the standalone game of the editor, though.
We are not using seamless travel. I found this other post in the answer hub about disconnecting clients with steam and I thought maybe the reconnection after the map has changed might cause the same problem. Therefore, I modified the UnregisterConnection function as proposed in this thread, but it did not solve our problem.
I am still trying to figure out, what is causing the disconnect. If I understand the logs (Server and client logs attached) correctly, the issue appears after the server travel…
I hope if someone else runs into the same issues, this helps a bit!
However, if you have additional information on the topic, please feel free to comment below. Every bit of insight on the topic is welcome.