TLS 1.2 not negotiated in .NET 4.7 without explicit ServicePointManager.SecurityProtocol call
I had the same issue (Windows 10 and SSL3 / TLS only… not System Default) with a legacy app targeting 4.7.2. My issue was that during the upgrade process over the years we never added in the targetFramework to the system.web > httpRuntime element (Note: it did exist on system.web > compilation element). Before taking … Read more