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Spooky's avatar
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Spooky
answered 2019-11-14 23:18:29 +0000

Hi,

TCP SYN segment with Explicit Congestion Notification (ECN) in IP header can be dropped or have that feature removed by some firewall.

You can try capturing "before" and "after" the firewall to see if that's the case here.

Cheers,

Spooky