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This solution should help you to fix a webpage that has stopped working after you have shared its containing folder.

You will know if you have the same problem as you will get a 401 - Unauthorized: Access is denied due to invalid credentials error instead of your webpage when you try to access it online.

The Fix:
When you shared your websites folder it removed the IUSR account which allows anybody to access your webpage. All you need to do is also share the IUSR account for the same folder.