The invention concerns a network wherein a client application (16) sets up on 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) connected to a server network (11), for transmitting messages addressed to the server machine (13). The messages pass from the client network (10) to the server network (11) through a network layer (CR) of a gateway machine (9). In the gateway machine, a security secure application proxy transparently diverts the messages of the first connection for the client application, and establishes a second connection having a second security level with the server application, the second connection is unknown to the client.
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