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Using Custom Root CA on Fiddler?

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Silica
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Silica asked on 03 Apr 2021, 09:39 AM

Hello im trying to change the root CA that fiddler uses, i generated my own using openssl-

openssl genrsa -out rootCA.key 2048

and then

openssl req -x509 -new -nodes -key rootCA.key -sha1 -days 2048 -out rootCA.crt

 

then i went to about:config- and changed the fiddler.certmaker.bc.cert to the data inside the newly generated

crt file, and same with the fiddler.certmaker.bc.key, however whenever i load fiddler for some reason it writes the original certificate back to

fiddler.certmaker.bc.cert- i even tried replacing it in the windows registry at Computer\HKEY_CURRENT_USER\Software\Microsoft\Fiddler2\Prefs\.default but again it just wrote the original certificate back into it.

 

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Nick Iliev
Telerik team
answered on 06 Apr 2021, 06:45 AM

Hello Silica,

Using custom root certificates is not supported by Fiddler. The functionality is requested as a feature here where you could also upvote it.

 

Regards,
Nick Iliev
Progress Telerik

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Nick Iliev
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