Fiddler certificate problem

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Mobile
Luis
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Luis asked on 14 Jan 2022, 12:57 AM
Imran
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commented on 25 Mar 2025, 04:27 PM

Hi, I’m unable to open this url http://ipv4.fiddler:8888/ in my safari browser getting this error.
Nick Iliev
Telerik team
commented on 26 Mar 2025, 11:35 AM

The term "ipv4.fiddler" is an internal alias used by Fiddler to refer to the loopback address. When Fiddler is opened at ipv4.fiddler:8888, it creates a local server that runs on 127.0.0.1:8888. If your remote device is unable to access the Fiddler page while using this alias, it likely means that either the remote device cannot reach the Fiddler host or the Fiddler application is not running. The ipv4.fiddler alias is only accessible when Fiddler is active, and both devices must be on the same network and properly connected.

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Rosen Vladimirov
Telerik team
answered on 14 Jan 2022, 06:37 AM

Hi,

http://ipv4.fiddler:8888/ is the Fiddler Classic's echo service and it will work on your machine only when you have the Fiddler Classic running and using the default port (8888). So, just run Fiddler Classic, ensure you are using port 8888 (in the Fidlder options -> Connections) and open the http://ipv4.fiddler:8888/ - it should work.

Regards,
Rosen Vladimirov
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Kateryna
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commented on 19 Jul 2023, 01:11 PM

It doesn`t help. I still see an error 
Nick Iliev
Telerik team
commented on 19 Jul 2023, 01:19 PM

The error indicates that, for some reason, your remote device is not "seeing" the Fiddler proxy. While there are many possible reasons why that happens, the most common are:

- The proxy is not properly configured on the target device.

- The Fiddler host Is not in the same local network as the target device.

- A security tool (like a firewall, antivirus, zero-trus tool, administrative policies, etc.) limits network access.

 


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Luis
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Rosen Vladimirov
Telerik team
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