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Hello,
I happen to have the same problem on a customer's network.
Client machines and Server are separated by a VPN S2S link. The communication happens over 2 TCP ports, of them being 80 and one non standard value, let's say (under 1000).
I saw that from time to time, the TCP handshakes pass through, but not the data afterwards, just like the case here. Also the TTL is changed on the way, from 128 - x as expected value to 255 - y.
I suggested to check the routing and the Application Id. I keep you posted with the evolution.
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