Unity - Scripting API:

public function DropConnection(netId: Networking.Types.NetworkID, dropNodeId: Networking.Types.NodeID, callback: ResponseDelegate<BasicResponse>): Coroutine;

public function DropConnection(req: Networking.Match.DropConnectionRequest, callback: ResponseDelegate<BasicResponse>): Coroutine;

Parameters

callback	A callback delegate that takes a BasicResponse that indicates the return of the request after coroutine processing.
req	A DropConnectionRequest describing the match to destroy.
netId	Id of the match to drop from.
dropNodeId	NodeId of the client to drop.

Coroutine A coroutine for managing the async operation. if using the callback, this can be ignored.

This causes a client to be dropped from a UNET Matchmaker match.

Only the host can do this (?). This is asynchronous, the callback function will be invoked when the operation completes.