This version of Unity is unsupported.
Method group is Obsolete

NetworkManager.runInBackground

Obsolete The high level API classes are deprecated and will be removed in the future. public bool runInBackground;

Description

Controls whether the program runs when it is in the background.

This is required when multiple instances of a program using networking are running on the same machine, such as when testing using localhost. But this is not recommended when deploying to mobile platforms.