The WinHTTP Web Proxy Auto-Discovery service must be running....
If for any reason you can't change the startup type, because is disabled.
reboot.
src - https://feedback.telerik.com/fiddler/1361492-failed-to-register-fiddler-as-the-system-proxy
ref - extract application by setup
If for any reason you can't change the startup type, because is disabled.
JavaScript:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinHttpAutoProxySvc]
"Start"=dword:00000002reboot.
src - https://feedback.telerik.com/fiddler/1361492-failed-to-register-fiddler-as-the-system-proxy
ref - extract application by setup