This version of Unity is unsupported.
Method group is Obsolete

NetworkServer.dontListen

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

Description

If you enable this, the server will not listen for incoming connections on the regular network port.

This can be used if the game is running in host mode and does not want external players to be able to connect - making it like a single-player game. Also this can be useful when using AddExternalConnection().