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Close all your browsers.
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Open Wireshark on macOS. Select your main network interface and set your capture filter to:
host 2604:a880:400:d0::e0:5001 or host 162.243.165.63
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Start Wireshark capture. Make your request in macOS using a browser that succeeds (such as Chrome).
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Press the red "STOP" button and then File->Save the packet capture somewhere. Call it
working.pcap
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Start again. Close all your browsers, open Wireshark, same network interface, same capture filter.
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Try to connect using macOS Safari to the website. Assuming it fails, press the red "STOP" button, and File->Save the capture. Call it "broken.pcap".
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Upload the two packet captures somewhere and link it here.
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