RESOLVING IIS 403 FORBIDDEN: ACCESS IS DENIED
You do not have permission to view this directory or page using the credentials that you supplied.
Every time IIS (Internet Information Services) is given a folder to access with information on a website, the 403 error page will appear if the right permissions are not given to the folder. It is a simple fix, but I don’t know why Microsoft hasn’t posted a proper answer on their KB, MSDN or their other support forums on this issue.
If you have just created an HTTP/HTTPS site on IIS 7/8 (may be true for other IIS installs as well), you need to assign IIS_IUSRS security permissions to your assigned web folder. To do that,
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1. Right click on the folder (the folder you assigned for web access in IIS)
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2. Choose “Properties” (or “Edit Permissions” if you right clicked while inside the IIS window)
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3. Go to “Security” tab
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4. In the top box, “Group or user names”, open “Edit…” (will take you to Permissions window)
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5. You will most likely cannot fine IIS_IUSRS in the list; open, “Add..”
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6. In the box at the very bottom, “Enter the object names to select (examples):” enter IIS_IUSRS
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7. Click OK and make sure in the Permissions window, you have allowed, Read & execute, List folder contents and Read
In a nutshell;Right click -> Properties/Edit Permissions -> Security (TAB) -> Edit (under Group or user names) -> Add (IIS_IUSRS) -> OK (make sure the right permissions described in steps 7 are there)