http://stackoverflow.com/questions/7250983/httpwebrequests-timeout-and-readwritetimeout-what-do-these-mean-for-the-unde
https://support.microsoft.com/en-us/kb/904262
https://msdn.microsoft.com/library/e1ax3cw0.aspx?f=255&MSPPError=-2147217396
https://msdn.microsoft.com/library/d4cek6cc.aspx?f=255&MSPPError=-2147217396
https://blogs.msdn.microsoft.com/buckh/2005/02/01/timeouts-on-the-httpwebrequest-and-thus-soap-proxies/