[Solved] blocking fiddler from interfering with certain apps

[aurelia]

hi, i am new to fiddler and i only use it to set up some private servers for games, and it ends up logging data from all my active apps even chrome, is there a way to stop fiddler from touching chrome/other apps while it only works with my games? even when i am on discord i have a hard time on calls because fiddler is on and i have to turn it off to make the voice call work smoothly without issues, is there a way i can block fiddler from interfering with discord?

[Nick Iliev]

Hi Aurelia,

 

There is no option to block a specific application from not using the operating system proxy (which is where Fiddler Classic is set when capturing). However, you can specify endpoints that should always bypass the Fiddler proxy and use the upstream proxy instead. This way, if you know the endpoints Discord uses, you can bypass them by adding them in the Tools > Options > Connections > Bypass Fiddler Classic for URLs that start with: text field. 

Then restart Fiddler Classic, and from that point on, any endpoint bypassed won't use the Fiddler proxy and will instead go directly through the default network settings.

Another option is to try Fiddler Everywhere, a modern-day alternative to Fiddler Classic. With Fiddler Everywhere, you can use Fiddler not as a system proxy but as an explicit proxy for a browser instance or a terminal application (and all its child processes). This way, you can, for example, start a dedicated browser instance that runs the specific web application (to be captured from Fiddler) and then have a separate application like Discord running without any interference from Fiddler.

 

Regards,
Nick Iliev
Progress Telerik

[Stephen]

The endpoint bypass approach makes sense, especially when Fiddler is needed for game-related testing but starts affecting other applications. Using an explicit proxy for only the application being tested also seems much cleaner than changing the system-wide proxy behavior.

 

[Nick Iliev]

Another point for switching to Fiddler Everywhere: it now supports capturing traffic through the network driver/extension (the Network capturing mode), which can also be configured to capture traffic only from specific ports and/or processes.