Secure multiapplication proxy

Method for allowing a client application (16) to establish, in a client network (10), a first connection having a first security level, directly with a first port (1) of a server application (17) hosted in a server machine (13) linked to a server network (11), in order to send messages (30) addressed to the server machine (13), said messages (30) passing from the client network (10) to the server network (11) through a network layer (CR) of a gateway machine (9), characterized in that it comprises:

• a first step that creates a second port (3) in the gateway machine (9);
• a second step that orders the network layer (CR) of the gateway machine (9) to reroute to the second port (3) any message sent to the first port (1), addressed to the server machine (13);
• a third step that listens to the second port (3);
• a fourth step that generates, in the gateway machine (9), a thread for establishing said first connection when the third step detects in the second port (3) a request to establish said first connection.