Custom Login and subsystem

I would like to build a fps game that has its own login and subsystem (including friends, finding session to join).
All the session is host by the server so that when the room creator is leave the game and the session is still hold until the game is ended.

Is the default onlinesubsystem null available as it seems only work for lan only

there’s a server built in UE…think these tutorial might be of help to you: Blueprint Networking Tutorials and Introduction to Blueprint Networking …i used them when working on these small projects…good luck