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Insecure conection on firefox?

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Flexagon
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Flexagon asked on 24 Mar 2019, 08:27 PM

I never had this issue before, but here's what I did. tools > options > ttps > actions > reset with fiddler, and gave me "Added fiddler's root certificate to Machine Root List". On firefox, I did tools > options > Network settings > Configure Proxy Access to the Internet > user system proxy settings.

Another thing I tried is exporting the certificate from fiddler, then on firefox, tools > options > certificates > View certificates > import, then importing the fiddlerRoot.cer, but still get insecure connection.

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Simeon
Telerik team
answered on 28 Mar 2019, 01:33 PM
Hello Flexagon,

Could you please, provide the version of Fiddler you are using. I recommend updating to the latest one.

If the problem still persists, please, try to reset your Fiddler certificate by following the procedure here. Then, remove the old DO_NOT_TRUST_FiddlerRoot certificate from Firefox as well and import the new one.

I hope that this procedure will solve your issue as I was not able to reproduce it.

Regards,
Simeon
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Flexagon
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answered on 30 Mar 2019, 07:34 PM

I tried doing the things in the post you linked, and firefox is now showing

Did Not Connect: Potential Security Issue

Firefox detected a potential security threat and did not continue to www.youtube.com because this website requires a secure connection.

 

However, it does detect some https connections like from discordapp.com . Is there a way I can manually add the exported certification to firefox?

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Simeon
Telerik team
answered on 03 Apr 2019, 11:09 AM
Hi Flexagon,

Yes, you can manually add the exported Fiddler root certificate to Firefox.

1. In Firefox open about:preferences#privacy in a new tab.
2. Scroll to the bottom and click the View Certificates... button.
3. In the Certificate Manager window click the Authorities tab.
4. Click the Import... button and in the Select File containing CA certificate(s) to import file browser navigate to the FiddlerRoot.cer file and open it.
5. A Downloading Certificate dialog window will appear. Make sure that the Trust this CA to identify websites. checkbox is checked and click the OK button.
6. Click the OK button in the Certificate Manager window as well.

Now you should be able to open https://www.youtube.com while Fiddler is capturing HTTPS traffic.

Regards,
Simeon
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Simeon
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