I had the same problem and got it fixed by going to your C: > Users > [UserNameUsed] > %appdata% > Local > EpicGamesLauncher > Saved > Config > Windows. Open as notepad and find the line: MulticastEndpoint;
In the port number change the last 3 digits to 345. For example: 230.0.0.1:6666 —> 230.0.0.1:6345
Worked for me and hopefully will work for you!