Abstract: A method at a computing client located behind a NAT and restrictive-access firewall, including establishing a control connection with a TCP TURN server utilizing a port capable of traversing the restrictive-access firewall; requesting an allocation of an client service identity from the TCP TURN server; and receiving, from the TCP TURN server, a response containing the client service identity, the client service identity being independent of any port used to communicate with the TCP TURN server. Further a method at a TCP TURN server, including listening on a first port for communications from a computing client, the computing client being behind a restrictive access firewall and the first port capable of traversing the restrictive-access firewall; establishing a control connection with the client on the first port; receiving a request for an allocation of an client service identity from the computing client; and sending a response containing the client service identity.

Abstract: A method and a relay service node to facilitate establishment of a secure connection between a first node within a restrictive access network, and a second node, the method accepting a control connection from the first node; accepting a second connection from the second node, and receiving, over the second connection, a message requesting secure connection establishment with the first node and providing an identifier for the first node; sending, over the control connection, a connection attempt request to establish a third connection from the first node; accepting the third connection from the first node; binding the second connection with the third connection; and forwarding the message requesting secure connection establishment with the first node to the first node.

Abstract: A method at a computing client located behind a NAT and restrictive-access firewall, including establishing a control connection with a TCP TURN server utilizing a port capable of traversing the restrictive-access firewall; requesting an allocation of an client service identity from the TCP TURN server; and receiving, from the TCP TURN server, a response containing the client service identity, the client service identity being independent of any port used to communicate with the TCP TURN server. Further a method at a TCP TURN server, including listening on a first port for communications from a computing client, the computing client being behind a restrictive access firewall and the first port capable of traversing the restrictive-access firewall; establishing a control connection with the client on the first port; receiving a request for an allocation of an client service identity from the computing client; and sending a response containing the client service identity.