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1Anyone can use any source port of their choice. The first 0-1024 reserved port are reserved, but nothing preventing them from making conscious decision to set the source port as 443.– DariusCommented Feb 3, 2014 at 22:20
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Why would anybody do this though?– Johannes ErnstCommented Feb 3, 2014 at 22:21
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Isn't Port 443 the HTTPS port?– dotVezzCommented Feb 3, 2014 at 22:22
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@dotVezz indeed, which is why it is so surprising that this port is the source (rather than the destination) port.– Johannes ErnstCommented Feb 4, 2014 at 0:12
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1I'm seeing this a lot coming from Google IP addresses.– MichaelCommented May 27, 2016 at 20:14
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