FishNetNetworkManager

The FishNetNetworkManager (or a variant of it) should be placed in the game loading scene, and linked to from both the NetworkManagerClient and NetworkManagerServer components of the GameManager prefab/variant in that scene.

Games created with the New Game Wizard have a variant of this prefab automatically placed in the loading scene.

This prefab contains all the scripts necessary to run the game in FishNet client or server mode.