Establishing a connection is disclosed. A first communication link with a perimeter gateway located external to a private network firewall but behind a perimeter network firewall is initiated. A request to allow the connection from a requestor that has requested the connection to an internal server via the perimeter gateway is received. A second communication link with the internal server protected by the private network firewall is initiated. The connection is allowed at least in part by associating together the first communication link with the second communication link.