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copied!<p>I know its probably not polite to answer your own question, but I believe I tracked down what the problem was.</p> <p>After a reboot (and many, many, <strong>many</strong> minutes wasted on Automatic Updates) I tried again, and experienced the same problem, but I took solice from Alex K. and J.J.'s comments suggesting this is not the expected behavior, and started investigating software running on the machine that might interfere.</p> <p>After many applications were terminated, and many services were turned off, I stumbled across one service that I really hoped wouldn't have this kind of effect, however it did.</p> <p>I turned off "Kaspersky Lab Network Agent", and hey-presto, InternetOpenUrl returned about 2 seconds after download of the HTTP response started. I would have preferred immediately, but a second or two of a 75 second download at least gives WinINET time to process headers and do whatever pre-processing it might need to.</p> <p>It also turned out that if I don't read the data from InternetReadFile(), the download never completes (as seen via Charles), implying (hopefully) that InternetReadFile() is a wrapper around the recv() call indeed (as I would have expected).</p> <p>Successive re-enabling and disabling of the Network Agent Service validated this finding. I would like to somehow conclusively prove (or disprove) this.</p> <p>So it turns out, my (read: IT Security Department's) choice of anti virus and its intercept-all-network-layer-communications protection appears to have been the cause of the problem. </p>

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