HTTP403: FORBIDDEN - The server understood the request, but is refusing to fulfill it.
(XHR): GET - https://netdna.bootstrapcdn.com/bootstrap/3.3.6/css/less/normalize.le
I haven't figured out which 3.3.6 package makes no reference to Less files. But the following steps worked for me. To remove the errors from the console in IE Edge, or any browser for that matter, simply download the "Source Code" package from Bootstrap and at the very least, make sure to reference the less and dist folders from that package, under your Bootstrap css folder. Bootstrap will take care of the rest and you will no longer see the errors in IE edge.
As already mentioned on this page, don't use the CDN links. My current setup looks like this in my
area...
With a folder structure like so...
css
less
dist
Hope this helps