Fiddler is one of my favorite tool, very useful for a developer, but unfortunately, it didn’t work on my new laptop and it was impossible to activate the capture “Failed to register Fiddler as the system proxy”. In order to check if the cause of the issue was Windows or Fiddler, I tried to change the proxy of Internet Explorer and same issue, no way to set the proxy.
So if you have the same issue than me, here is the solution!
Type Windows+R and enter services.msc is the textbox.
Then look for WinHTTP Web Proxy Auto-Discovery Service, right click and select Properties.
Change the startup type to Automatic and then click on Start.
If for any reason you can’t change the startup type cause disabled, open regedit, go to HKLM\SYSTEM\CurrentControlSet\services\WinHttpAutoProxySvc and change start value to 2.