Fiddler uninstall issue

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Fiddler Classic Windows
patrick
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patrick asked on 09 Nov 2021, 02:38 PM

My enviroment:

I run my connection through a barracuda web security gateway proxy that uses a pac file to connect

 

Issue.

I was running into an issue with google earth pro and was attempting to use fiddler to troubleshoot the issue. I installed fiddler without admin permissions. Google earth pro streetview fails to download images due to 407 error (Web page that renders image gives a failed to pass or parse credentials from proxy.)

The issue I am running into is when I run fiddler it "fixes" the issue without indication of where the issue came from. I uninstall fiddler and the "fix" remains even after removing google earth pro registry files tmp files and cached files, something on my system changed when installing fiddler that prevents the images in google earth pro from using my pac file when connecting. I cant seem to find out what change was made to reverse it even after an uninstall of fiddler. Any help or information regarding what system changes are made with the fiddler installer would be greatly appreciated.

Thank you,

Patrick

Nick Iliev
Telerik team
commented on 09 Nov 2021, 04:05 PM

Hey Patrick,

 

I am a bit unsure of the outcome (after using Fiddler). Is the issue still appearing (... Google earth pro streetview fails to download images due to 407 error.. and later ...  something on my system changed when installing Fiddler that prevents the images in google earth pro from using my pac file when connecting ...) or is the issue "fixed" (...  when I run Fiddler it "fixes" the issue without indication of where the issue came from. I uninstall Fiddler and the "fix" remains ...)?

 

In any way, it looks like that the Barracuda gateway is another intermediate proxy that stands between the client and the server. When running, Fiddler will chain to that proxy and will serve as MITM, but after turning it off, it will reverse all system settings. You can check some of the possible issues that Fiddler can fix - there is a dedicated blog post on the matter here: https://www.telerik.com/blogs/help!-running-fiddler-fixes-my-app-

 

patrick
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commented on 09 Nov 2021, 04:24 PM

launching google earth pro without fiddler installed streetview does not work (doesnt download the image)

Installing fiddler google earth pro streetvew works and images are downloaded without issue

uninstalling fiddler google earth pro should block images again however it still downloads and renders streetview with no issues.

My question is what changes are made to the computer durring the installation process when fiddler is installed without admin permissions So I am able to block streetview again.

I have not found new firewall entries and I was curious if this creates or edits registry files in the current user local machine ect that would cause google earth streetview images to bypass my web security gateway

patrick
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commented on 09 Nov 2021, 04:28 PM

If the changes are reversed when fiddler is not running/uninstalled this should result in streetview not working again however the change is persistant after uninstallation of fiddler.
Nick Iliev
Telerik team
commented on 11 Nov 2021, 10:26 AM

Fiddler is not storing any proxy or network-related settings - after the proxy is removed (Fiddler capturing is turned off, FIddler is stopped or uninstalled), all of its settings are removed as well. The scenario you describe sounds like these resources were cached by Google Earth Pro (during the working Fiddler proxy). After Fiddler was uninstalled, these cached files are causing Goooge Earth Pro to behave as "fixed," but probably that is not the case.

No answers yet. Maybe you can help?

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