ERR_INTERNET_DISCONNECTED whenever attempting to load page with developer tools open

It is caused by hard-to-notice internet-connection-simulation setting in the developer tools.

1. Open developer tools in Chrome
2. Go to Network
3. Just below menu when you've selected Network, possibly next to "disable cache", there is a select option - if you are getting ERR_INTERNET_DISCONNECTED with seemingly no reason =>
   => Offline will probably be selected.
   This can be confusing and hard to find, because this select option doesn't have any label or title, only thing you see is the selected option with an arrow...
4. To turn it off open the select option and under "Disabled" select "No throttling"

&jBTW: Creating new chrome profile will, of course, work too, but that would be kind of an "overkill" :-)

Image Guide:

Open command prompt and type below commands,

ipconfig /flushdns
ipconfig /renew

The above CMD trick working for me.

More Solution of ERR_INTERNET_DISCONNECTED: http://www.wiknix.com/how-to-fix-err_internet_disconnected-error/