Why Safari shows "No Inspectable Applications" during remote debugging with iOS 6 device?

An update for iOS 9 (using OSX El Capitan):

On your mobile device under Settings -> Safari -> Fraudulent Website Warning = OFF [default = ON]

I also needed to re-connect the iPhone after changing this setting

This solved it for me.

If you have private browsing enabled in Settings > Safari, you will not be able to use remote debugging. If you turned off private browsing, it will work like a charm.

I recently had problems debugging a UIWebView in desktop Safari – and it turns out the problem was with my Xcode configuration for the app. The most recent build had been provisioned for production, rather than for Testing. After re-building the app for Testing, it showed up once more in the Safari Debug menu :-)