A secure handshake service is implemented among a plurality of UPnP (Universal Plug and Play) portable media devices and endpoints in an open network hosting one or more UPnP services. A first portable media device receives a first request for a hosted service from a second portable media device via the network. The first portable media device authenticates authorizes the second portable media device as a function of the certificate of the request. The second portable media device is allowed to access the requested service hosted on the first portable media device if the second portable media device has been authenticated and authorized by the first portable media device.