Release 5.6.0.1 of the Windows App included security improvements for the connection to the server.
This error may appear when running older versions of Windows. In order for our security enhancements to work, please apply the recommended patch.
Use this link for the patch that needs to be applied to Windows 2008, 2012, and 7 to fix the problem: https://support.microsoft.com/en-us/topic/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-winhttp-in-windows-c4bd73d2-31d7-761e-0178-11268bb10392.