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Intermediate ASA-5525 breaks communication after 3-way handshake, Why?

jmaxwellUSAF
Enthusiast
Enthusiast

Please view attached image. (**undocumented is that a Nexus 9k lives between the ASA and the "server".)

1. What might be the cause of the illustrated symptom?

2. Could this symptom be caused by the MSS inconsistency =1380 outbound vs.1460 inbound?

3. Could this symptom be caused by some kind of deep packet inspection? If so, how can I determine that?

Maybe this is relevant (I'm reading it right now) --Cisco ASA TCP State Bypass | Blue Network Security (bluenetsec.com)

Thank you.