Fix Blank Login Page After Publishing to Web Server Uncaught ReferenceError jQuery is not defined

If you have a blank page you might receive an error in your web browser console (because you hit F12 and selected the console Tab to See the error as to why you have a blank page.) Something to the effect that JQuery is undefined as below.

Uncaught ReferenceError: jQuery is not defined.

This might be a folder permissions issue in IIS , one quick test to find out is to grant everyone permission to the Script and Content folders using Windows Explorer.

If after adding those permissions for everyone to the folders you are now able to browse the web site - you know your application pool is not running with permissions to those folders. In no way do you want to leave it with everyone having permissions to the folders, so grant your application pool rights and you should be good.