HTTPS Decryption Broken After W10 Anniversary Upgrade

[Filip]

Hello,

I use Fiddler quite frequently for decoding HTTPS traffic, but it stopped working after I got the Anniversary upgrade installed and I'm not able to figure out what's wrong. It looks like the problem occurs on SSL "Version: 3.3 (TLS/1.2)" - the Fiddler HTTPS options dialog doesn't offer TLS 1.2 in supported protocols: "Select the HTTPS protocol versions allowable for server connections. Valid tokens are: <client>; ssl2; ssl3; tls1.0" and our application servers support just latest TLS 1.2 version. The connection from my C# application to the server works until I enable Fiddler capture with HTTPS decryption. I can see the handshake in Fiddler, but not the real request - I just get "Could not establish secure channel for SSL/TLS with authority" in my C# application instead.

Any idea what could I try to get TLS 1.2 capture + decryption working in Fiddler again?

[Filip]

I already tried to remove all the Fiddler certificates, uninstall Fiddler completely a install it once more along with new Fiddler certificates generated from the HTTPS Options dialog, but it didn't change anything.

[Tsviatko Yovtchev]

Hi,

Which version of Fiddler are you using? The latest one offers "Valid tokens are: <client>; ssl2; ssl3; tls1.0; tls1.1; tls1.2". So, you could just add tls1.2 there.

Regards,
Tsviatko Yovtchev
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