Computers, Programming, Technology, Music, Literature

Fiddler: Creation of interception certificate failed

with 2 comments

This post is a direct solution from hyperlink – I find myself doing it a couple of times every month, and keep googling. Instead I thought I’d have a copy of the post myself.



If you get the Fiddler error “

Unable to Generate Certificate
Creation of the interception certificate failed.

makecert.exe returned -1.

Results from C:\Program Files (x86)\Fiddler2\MakeCert.exe -r -ss my -n "CN=DO_NOT_TRUST_FiddlerRoot, O=DO_NOT_TRUST, OU=Created by" -sky signature -eku -h 1 -cy authority -a sha1 -m 132 -b 04/29/2013

Error: Can’t create the key of the subject (‘JoeSoft’)




Navigate to


and delete the contents of the folder.

(hit that damn Yes button)


Written by gmaran23

April 30, 2014 at 1:50 pm

2 Responses

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  1. Rajan

    October 23, 2015 at 6:00 am

  2. Thanks you so much for this blog entry!
    I ran into the same issue and was pulling my hair out to resolve this..


    October 23, 2015 at 5:31 am

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