properly wait for the connect to be confirmed. See test case 564 for a first

  shot at a test case.

64. The threaded resolver used in libcurl on Windows has some kind of race

  problem when multiple simultanoes resolves are done, like with the multi

  interface transferring many files in parallell:

  http://curl.haxx.se/mail/lib-2009-04/0028.html

63. When CURLOPT_CONNECT_ONLY is used, the handle cannot reliably be re-used

  for any further requests or transfers. The work-around is then to close that

  handle with curl_easy_cleanup() and create a new. Some more details: