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Sounds to me you need to look for trouble in System B. If that one throws back errors about unauthenticated connections and all.
But for a proper analysis one needs to capture at least at 2 spots. As close as possible towards the client and similarly as close as possible to the server.
But you picture shows packet loss. Which is detectable by the Selective Acknowledgement packets. Not all server packets get back to the client or at least not in time.
Doing the capture on both ends will give some insigth were packets are lost. But in this case it could very well be in the connection between the two networks and not in the machines themselves.
