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Multiplayer standalone doesn't find session anymore. No changes to project or engine

When I test my project (multiple windows, standalone) and host (listen server, LAN) in one window, I can't find the session in the others. Now, it could be a mistake by me, right? But it worked before, always, reliably.

I continued with a copy of this project in a newer engine version and realized, that find sessions didn't work anymore. So I went back to the older versions of the project, that definitely worked as I stopped with them.

The host is successful (I use advanced sessions plugin, the default unreal engine nodes don't make a difference, I thried it), the find sessions is successful, too. There are no errors.

Strange to me: The standalone windows work with an export of this project over network to another computer (both server/client constellations), but the standalone windows don't communicate among themselves on one computer (I also tried to test the project on another computer, same network. Same result).

So, I can export and use it, since I normally don't want to play multiple instances on one computer, but I need to be able to test it in the engine for developing.

Because I'm not a programmer and at the moment not capable of c++, I don't know, what's going on and how to solve it, since this seems really strange to me because it worked before and I didn't change anything. Actually I copied the project several times and none of these old projects find sessions anymore (UE 4.15, 4.17., 4.18, 4.19).

Thank you for your help, apsodi

Product Version: UE 4.17
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asked Apr 12 '18 at 05:45 PM in Blueprint Scripting

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