Fiddler Error Connecting to HTTPS Applications !SecureClientPipeDirect failed - fiddler

Question

Fiddler Error Connecting to HTTPS Applications
Fiddler Log:
!SecureClientPipeDirect failed: Authentication failed because the remote party has closed the transport stream. on pipe to (CN=services.bigpond.com, O=DO_NOT_TRUST_BC, OU=Created by http://www.fiddler2.com)
I have followed other posts but no answers

Answer 1

The typical explanation for this message, as documented in many places, is that the client application has not been configured to trust Fiddler's root certificate. As such, the client closes the connection to Fiddler when it sees the untrusted certificate.
http://fiddler2.com/documentation/Configure-Fiddler/Tasks/TrustFiddlerRootCert

Answer 2

In Kestrel I'm using an SSL cert.
I 'downgraded' the TLS protocol in order to get this to work.
This is not something you'd do in production - but in production you shouldn't be using kestrel. I'm not saying this is the best overall config, but this is mainly to show the SslProtocols option.
WebHost.CreateDefaultBuilder(args)
.UseKestrel(options =>
{
options.Listen(IPAddress.Any, 5000); // http:localhost:5000
options.Listen(IPAddress.Any, 44300, listenOptions =>
{
// https://dotnetthoughts.net/enable-http2-on-kestrel/
//listenOptions.Protocols = Microsoft.AspNetCore.Server.Kestrel.Core.HttpProtocols.Http2;
listenOptions.UseHttps(#"S:\WORK\SSL\example.com.pfx", "cert-password", httpsOptions =>
{
httpsOptions.SslProtocols = System.Security.Authentication.SslProtocols.Tls;
});
});
})
.UseStartup<Startup>();