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Which TCP reserved bit? ECN? The reserved fields in the ack?

Since it is firewall dropping the packet, and during initial connection (that’s why websites load slow), I doubt it’s ECN. Firewall would know about ECN.

I don't know. I don't have raw packet. just the log in firewall that does not specify which bit.

We can't help much without a raw packet. Can you get a capture from the firewall?

Or failing that, setup some other way to capture packets (does iOS do reverse tethering? or you can setup a different wifi access point and capture packets between that and the firewall, etc)

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