To detect the application port traffic between a server and a client, the Configuration Utility must be able to see the SYN-ACK packet. The SYN-ACK packet, which acknowledges a client request, is sent from the server side of a TCP session. The Configuration Utility must see a SYN-ACK packet to display the corresponding TCP session data in its Application, Server, and Network lists.
If the Configuration Utility only shows server side traffic, for example, Bytes from Server but not Bytes to Server, you may have asymmetric routing. Asymmetric routing occurs when one direction of the TCP session is not flowing through the port you are mirroring. To properly monitor TCP response times for the application, you may need to mirror more source ports to the monitoring device, possibly from a redundant switch that sees the client side of the TCP session.
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