A method and a device are provided for managing, in a receiving entity, data packets received from a transport layer connection established with a transmitting entity. The connection includes at least one stream in connected mode and at least one stream in non-connected mode. The management method includes transmitting, by the receiving entity, a so-called return message, relating to at least one data packet from one of the two streams in connected mode or in non-connected mode of the connection, the return message being transmitted to the transmitting entity on the other stream of the connection.