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It feels like the article ends with a cliffhanger!

Why did a single packet of the custom protocol get through with all later packets dropped? Does anyone know?

my guess is the first packet got through a firewall, which created a flow.

subsequent packets then got blocked because the firewall has no way of matching this to an existing flow.

Definitely the most likely

Yeah! I am baffled that even one got through, but given that it did, why only one? And I would’ve immediately tried the “every protocol” version at that point…

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