In one embodiment, network data exchanged between a client computer and a remote server computer are scanned for computer viruses at a first network security computer. The first network security computer creates connection information about the connection between the client computer and the server computer, and registers that connection information with a second network security computer that may receive network data transmitted in the connection. This allows the second network security computer to forward to the first network security computer network data transmitted in the connection even when the first and second network security computers are configured for asymmetric routing.