Abstract: In some examples an Outbound Proxy Server (OPS) of a server internal to a firewall receives an inbound service request for a particular service from a Reverse Channel Proxy (RCP) server external to the firewall through an outbound connection across the firewall. The particular service is internal to the firewall. The firewall is to enable entities internal to the firewall to originate connections across the firewall to entities external to the firewall and to block connections originating from entities external to the firewall. The OPS creates a connection for sending data to a corresponding remote server internal to the firewall storing the particular service. The OPS also forwards the inbound service request to the particular service through the created connection.