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fiddler everywhere connect itself to proxy

im testing fiddler everywhere the second time and it prompt error "err_proxy_connection_failed". (attach screen capture)

thus unable to sign-in to fiddler from the fiddler everywhere app.

the first time i launch fiddler, i change to the connection to listen on 8080. it was all working fine, able to capture traffic from browser.

im not using any proxy on my linux, and my network do not use proxy.

anyone has solution for this?

Hey Koonmun25,

It seems like when Fiddler Everywhere starts, there's a proxy set on your machine. It could be a leaked proxy setting from previous Fiddler Everywhere run or from some other tool. In order to test this, can you please try the following:
1. Ensure Fiddler Everywhere is stopped.
2. Open your Operating System network settings and ensure proxy is not set there. If there's something set, please clean it and disable the proxy.

3. Start Fiddler Everywhere

If this does not help, can you please send us the following information:
1. Your OS name and version.

2. Your Desktop version - if it is Linux, does it use Gnome, KDE, etc.

3. Your Logs located at:
- Linux: `~/.config/Fiddler\ Everywhere/Logs`
- macOS: `~/Library/Application\ Support/Fiddler\ Everywhere/Logs`
- Windows: `%APPDATA%/Fiddler Everywhere/Logs`


Hi Rosen,

Thanks for your help.

the steps provided to test, tried a few time and it does not work. Fiddler Eveywhere still pick up the proxy setting 


I did not set any proxy setting on my machine. Proxy setting for the network adapter is set to none.


I use firefox and proxy is set to none, i have no issue connecting to the network and Internet.

If i run a "charles proxy" on port 8080 on my machine, and I start Fiddler everywhere, it will load successfully and able to sign-in to fiddler smoothly.

where and which location or file exactly Fiddle Everywhere read and pick up this proxy setting on my Linux machine from?

my machine
1. kali linux OS Debian-derived

Linux kali 5.7.0-kali1-amd64 #1 SMP Debian 5.7.6-1kali2 (2020-07-01) x86_64 GNU/Linux

2. Desktop is XFCE

I have attach the log 

(187 KB)
(28.7 KB)

Hey Koonmun25,

Thanks for providing this information. Fiddler Everywhere uses the dconf settings for setting/getting the proxy configuration. Looks like the UI in your system stores the data in different location.
In order to remove the setting, you can use the dconf-editor and remove the org.gnome.system.proxy
After that restart Fiddler Everywhere and it should work fine.

Can you try the suggested approach and inform us if it works on your side?

Rosen Vladimirov

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Thanks Rosen

You point me to the right direction.

The org.gnome.system.proxy setting for my machine cannot be remove.

After I go into HTTP and HTTPS subfolder to remove the setting from there, Fiddler Everywhere now works. Enable to sign-in and get connected.



Hey Koonmun25, 

I'm glad it helped. Can we consider this case as resolved? Are you able to stop Fiddler Everywhere and then start it again without manually modifying the dconf settings?

Rosen Vladimirov

Hi Rosen,

Its resolved, setting is permanent.

Restart both Fiddler and OS a few times. All working good now.

Thanks again



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