HTTPS Decryption Broken After W10 Anniversary Upgrade

3 posts, 0 answers
  1. Filip
    Filip avatar
    2 posts
    Member since:
    Mar 2012

    Posted 24 Aug Link to this post

    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?

  2. Filip
    Filip avatar
    2 posts
    Member since:
    Mar 2012

    Posted 24 Aug Link to this post

    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.
  3. Tsviatko Yovtchev
    Admin
    Tsviatko Yovtchev avatar
    409 posts

    Posted 30 Aug Link to this post

    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
    Telerik by Progress
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