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Fiddler not working with an app

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This is a migrated thread and some comments may be shown as answers.
Frédéric
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Frédéric asked on 24 Apr 2020, 09:34 PM

Fiddler works well with many apps on my PC except one that gives me the following message (image attached).

I tried fixiing the errors by clearing and re-installing certificates many times. It doesn't seem to work. If I click yes to the pop-up (in the image I attached), the app internet functionnalities stop working.

 

Did any of you had something similar? How could I fix this?

 

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Eric R | Senior Technical Support Engineer
Telerik team
answered on 28 Apr 2020, 09:45 PM

Hi Frédéric,

This is likely because the remote host server doesn't trust the Fiddler Root Certificate and they are using a form of Certificate Pinning. In this case, the remote host will not allow decrypting the traffic. Unfortunately, this is a security measure by the owner of the application and is expected behavior. The only way to resolve the issue is to have access to the hosts certificates and keys.

I hope this helps. Please let me know if you need any additional information. Thank you for using the Fiddler Forums.

Regards,


Eric R | Senior Technical Support Engineer
Progress Telerik

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Eric R | Senior Technical Support Engineer
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