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Creation of the interception certificate failed.
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This is a migrated thread and some comments may be shown as answers.
Manny
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Manny asked on 27 Feb 2014, 04:28 PM
After clicking on Tools | HTTPS | Capture HTTPS CONNECTS, the minute I click the box next to Decrypt HTTPs traffic Fiddler throws the following error:

makecert.exe returned - 1.

Results from c:\program files (x86)\Fiddler2\MakeCert.exe -r -ss my -n
"CN=DO_NOT_TRUST_FiddlerRoot,    etc, etc

Error:  Can't create the key of the subject ('JoeSoft')
Failed

See attached screenshot.

When I try to export the Root Certificate to the Desktop it throws the following error:
The root certificate could not be located.

OS:  Win8.1

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Eric Lawrence
Telerik team
answered on 05 Mar 2014, 06:28 PM
Please see https://groups.google.com/forum/#!searchin/httpfiddler/joesoft/httpfiddler/nsNNczdG2y4/MJ9s1sbyPc0J

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Jacques
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answered on 26 Feb 2015, 10:05 PM
Hello Eric Lawrence,

By installing the CertMaker in the add-ons list it should resolve the issue.  I tried and it is not working.  My environment is Windows 7.

Could you propose another resolution?  I tried a lot of thinks indicated in your post without success.

Regards,
Jacques
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Eric Lawrence
Telerik team
answered on 26 Feb 2015, 10:42 PM
Hello, Jacques--

To get help with this, you'll need to provide far more detail about your situation. For instance, after installing the CertMaker add-on, it's not possible to get the error message described in this thread, so I'm guessing that this isn't what you're seeing.

1. What have you tried thus far?
2. What exactly fails?
3. What do you see in Fiddler's LOG tab?

Regards,
Eric Lawrence
Telerik
 

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John
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answered on 28 Oct 2015, 04:11 PM
I had the same issues and what fixed it for me is this: 

1. Navigate to

   %userprofile%\AppData\Roaming\Microsoft\Crypto\RSA

2. Delete the contents of the folder.  (I did create a backup of the folder first)
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Eric Lawrence
Telerik team
answered on 28 Oct 2015, 06:00 PM
Hello, John--

Yes, that tends to resolve the problem, but it's potentially risky. The procedure you describe deletes all of the user's private keys from disk; this can be entirely harmless, or very very bad (if the user had any keys for non-Fiddler certificates).

These days, a safer and better choice is to switch to the Certificate Maker addon (or switch to CertEnroll as the generator).

Regards,
Eric Lawrence
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Bob
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answered on 24 Apr 2017, 02:14 PM
When configuring Telerik's Fiddler to handle HTTPS, I could not get root certificate installed. The error was "Failed to find the root certificate in User Root List". I solved the problem by temporarily turning off WebRoot, my antivirus program, then reattempting to enable HTTPS handling which installs Fiddler's root certificate. You may have to click the Action button on the HTTPS tab to remove/reset previous certificates before being able to create a new certificate.
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Manny
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Eric Lawrence
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Jacques
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John
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