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tcpdump and fw monitor missed packets

We are digging a issue with our application department.

Testing by our QA dept. the http connection could be a 5-6s latency occasionally.

So we did a packet capture.

the normal post and response:

the post that occurring latency as follows:

You could see the red column should be the POST request but the tcpdump shows "not captured"

and we also captured via fw monitor:

we can only see the POST request but no reponse:

Have you guys meeting this issues before?

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