Apparatus, methods and software that implement cross-connected, server-based, IP-connected, point-to-point connectivity between remotely located firewall-protected devices. The apparatus, methods, and software allow user computers to communicate with remotely located firewall-protected devices that without the necessity to configure the firewalls. The apparatus methods, and software are implemented using a relay server that runs software that implements communication between an arbitrary number of firewall-protected devices and an arbitrary number of firewall-protected user computers that are remotely-located from the devices.