'Connect via Network' not working for Web Inspector

I'm able to use the web inspector for my iOS Safari when it's connected via lighting, but when I tick the option for 'Connect via Network' and unplug the device just doesn't appear in the list to connect.


I'm using the latest versions of iOS and Safari and on the same WiFi network, but just can't seem to get it to work,


Anybody else had any issues with getting this working?


Thanks,