Fiddler with Proxifier

2 posts, 0 answers
  1. Rich
    Rich avatar
    1 posts
    Member since:
    Mar 2015

    Posted 19 Sep 2017 Link to this post

    I have an application that I use for work all the time that makes a web request to a server and responds with a unique key that I need for certain purposes. I don't like having to launch the application whenever I want a key, so I am using proxifier to forward the traffic to fiddler. I've tried it on two machines with out success. One machine uses windows 7 without .net 4 so I'm using fiddler2. On that machine the error is

     

    . System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted

     

    The other machine uses fiddler 4 and the error is

    fiddler.network.https> HTTPS handshake to 104.28.15.252 (for #1) failed. System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted

    Win32 (SChannel) Native Error Code: 0x80090326

    In both cases the request it fails on is the same

     

    A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

    Version: 3.1 (TLS/1.0)
    Random: 59 C1 92 62 E9 FA 23 04 AB 6F FE A4 10 7B 27 13 28 7B 49 59 5A 9A AB D8 F1 FA 39 71 37 86 00 37
    "Time": 5/28/2022 5:42:01 PM
    SessionID: empty
    Extensions: 
    none
    Ciphers: 
    [0035]TLS_RSA_AES_256_SHA
    [002F]TLS_RSA_AES_128_SHA
    [000A]SSL_RSA_WITH_3DES_EDE_SHA
    [0005]SSL_RSA_WITH_RC4_128_SHA
    [0004]SSL_RSA_WITH_RC4_128_MD5

    Compression: 
    [00]NO_COMPRESSION

  2. Alexander
    Admin
    Alexander avatar
    336 posts

    Posted 28 Sep 2017 Link to this post

    Hi,

    In order your application to work properly it has to trust Fiddler's root certificate. Usually this can be done by adding it to Windows' certificate store. Did you trust Fiddler's root certificate?

    Regards,
    Alexander
    Progress Telerik
    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
Back to Top