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Well that casts some light on it:
18:54:47.605039 IP 172.31.59.136.50391 > 15.193.112.22.80: Flags [P.], seq 1:285, ack 1, win 4140, length 284 E..Dl.@...&...;...p....P........P..,H%..GET /pub/softlib/software10/COL22660/mp-59689-2/CIT248813-HPU-REDBOX-v4.exe HTTP/1.1 Accept: */* Accept-Encoding: identity Range: bytes=1732422-1738810 If-Unmodified-Since: Tue, 18 Oct 2011 10:15:21 GMT User-Agent: Microsoft BITS/7.0 Host: ftp.hp.com Connection: Keep-Alive
…after which the client sits there thinking for a minute or so before asking for the next few kilobytes.