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Fiddler 4.6 can't connect to strong SSL?

Mistake:

[Fiddler] The connection to '<the site>.com' failed. 
System.Security.SecurityException Failed to negotiate HTTPS connection with server.fiddler.network.https> HTTPS handshake to <the site>.com (for #3) failed. System.IO.IOException Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. < An existing connection was forcibly closed by the remote host

In a web browser, I can achieve great results. I see this is pretty strong SSL (FireFox reports this as TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 256 bit keys, TLS 1.2)

Why can't Fiddler establish this connection?

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Check: Tools> Fiddler Options> HTTPS It is installed: ssl3; tls1.0 Add tls1.2



It seems that your client was not trying to connect via 1.2

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