Described embodiments may provide messages via websocket connections. A messaging system may maintain, on a first network, via the messaging system instances, a plurality of persistent websocket connections between each of a plurality of on-premise connectors and each messaging system instance. The messaging system may receive a message to be sent to an endpoint on a second network of an on-premise connector of the plurality of on-premise connectors. The messaging system may identify, via a registry associating on-premise connector endpoints to messaging instances, a messaging system instance of the plurality of messaging system instances via which to send the message to the endpoint. The messaging system instance may maintain the websocket connection to the on-premise connector in communication with the endpoint. The messaging system instance may transmit the message to the endpoint via the websocket connection to the on-premise connector.