In the absence of an answer from someone else here is what I have discovered, I hope it is useful for someone else. Executive Summary: Download SSPI enabled curl from http://curl.haxx.se/latest.cgi?curl=win32-ssl changing to Windows, zip, SSL-enabled, SSPI-enabled (7.19.5). Install Windows Open-SSL from http://www.slproweb.com/products/Win32OpenSSL.html and make a donation to support his bandwidth cost. Install the Visual … Read more
It sounds like your PC hasn’t contacted an authenticating domain controller for a little while. (I used to have this happen on my laptop a few times.) It can also happen if your password expires.
This means the other side is using another version of TLS and you are using an older version. Set up security attribute to TLS12 before making the connection. This is a widely known problem, as many providers start using TLS12 (e.g. paypal,amazon and so on). ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
I had this problem with an ASP.NET MVC app I was working on. I realized I had recently changed my password, and I was able to fix it by logging out and logging back in again.