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Playing with wireshark, I see a bunch of packets that say something like 

rgtp > https [ACK] Seq=???? Ack=?????? Win=????? Len=0

What is a Reverse Gossip Ttransfer Protocol? What is it used for, and by whom?

p.s. Google takes me to http://www.groggs.group.cam.ac.uk/protocol.txt which indicates acronym is a place-holder for Reverse Gossip Transfer Protocol but what does it mean in English

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It's not actually using RGTP. TCP connections have a randomised source port, and this just happens to have used port 1431, which IANA has assigned to that protocol. It's actually an HTTPS connection.

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+1: For pointing out it is HTTPS rather than RGTP. Uh. Would you happen to know what RGTP is? – Everyone Jan 18 at 15:49
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It's as described in that document - it's a bit like NNTP, a protocol for transferring news items. It's rather old and, so far as I know, only used by one site run for a small community of ex-Cambridge people. – pjc50 Jan 19 at 11:24
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