If you get “You are not authorized to view this page. (403 error)” message when trying to login into your WordPress website, you’ve encountered one of the most common WordPress errors – the HTTP Error 403.
HTTP 403 ERROR CAUSE:
- Problems with Directory Indexes if your blog is hosted on a Windows server
HTTP 403 ERROR SOLUTION:
Add index.php to the Directory Indexes. You can solve this WordPress error easily by adding index.php to the Directory Indexes. Just go to your Control Panel -> Web Options -> Directory Indexes and add index.php.