Fildder slow/throttle my internet speed even after i uninstall it.

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Fiddler Classic Windows
Jake
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Jake asked on 28 Oct 2023, 02:48 PM

Hi, install Fiddler classic for a assignment in my computer class, long story short i misread some sentence which led to me installing it even though i don't need to because i will be doing it at school. 

details:

i added the certificate nothing else.

after i found out i don't need to do this rn, i deleted through add program. 

i restarted my pc.

couple hours later i decided to download some game and my connection was slow down 14 mb compared to what i have before which can go up to to 50-100

it also affects the web download as well. 

i check the internet speed test it say my connection can go up to 100 mb but that doesn't meant anything.

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Nick Iliev
Telerik team
answered on 30 Oct 2023, 07:08 AM

Hello Jake,

 

Fiddler Classic is a forward proxy that when in capturing mode, sets itself as the system proxy. Once you turn off the Fiddler application, the system proxy settings are reset to their defaults. However, this tool does not modify or change in any way the network adapter abilities related to bandwidth. It is simply an HTTP/HTTPS proxy that works only when Fiddler is turned on.

To verify that the Fiddler proxy is removed once the application is stopped, you can check the Windows OS Proxy Settings screen. Make sure that the Fiddler proxy (127.0.0.1:8866) is no longer present once the application is not working.

It appears that the slow internet connection you experienced after using Fiddler might not be caused by the Fiddler tool, but rather by a third-party issue. To resolve the issue, it would be best to consult your ISP or network administrators.

 

Regards,
Nick Iliev
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Fiddler Classic Windows
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Jake
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Nick Iliev
Telerik team
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