Error - Failed to register Fiddler as the system proxy

[Giri]

When I try to run FiddleApplication.Startup(startupConfig)

FiddlerCoreStartupSettings startupSettings = newFiddlerCoreStartupSettingsBuilder() .ListenOnPort(0) .RegisterAsSystemProxy() .DecryptSSL() .Build(); FiddlerApplication.Startup(startupSettings);

In my log events I see:

Starting FiddlerCore/4.6.20191.7809 ...
** LogString: !WARNING: The DefaultLAN Gateway information could not be obtained.
** NotifyUser: Error - Failed to register Fiddler as the system proxy.


I'm running the process as administrator.

Note: When I run the normal Fiddler UI application everything works fine. Even running an older FiddlerCore version (2.3) is able to register itself as the system proxy.


P.S - I also see a warning in Visual Studio - "Please use Telerik.NetworkConnections.NetworkConnectionsManager to register the FiddlerCore Proxy as the system proxy." But I couldn't find any documentation/examples using NetworkConnectionsManager and I couldn't figure out how to use it.
fiddlercore fiddler-dev

[Giri]

I have asked the same questions on StackOverflow with better formatting : https://stackoverflow.com/questions/57870029/error-failed-to-register-fiddler-as-the-system-proxy

[Eric R | Senior Technical Support Engineer]

Hi Giri,

Unfortunately, the NetworkConnectionsManager is relatively new and the documentation isn't ready yet. Although, there is a pretty thorough explanation of how to use the Namespace at the How Do I Use Telerik NetworkConnections NetworkConnectionsManager forum thread.

Please review the forum post and let me know if you need any additional information. Thank you for using the Fiddler Forums.

Regards,

Eric R | Technical Support Engineer
Progress Telerik