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If you set the permissions in a Linunx Linux environment, you must set them right every time you create new files.
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find ~/public_html -type d -exec chmod 755 {} \;
find ~/public_html -type f -exec chmod 644 {} \;
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If the webpage is not visible, execute-rights 
are missing from "Others" group. Execute-rights must be both in public_html and home drive flders:
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chmod o+x ~
chmod o+x ~/public_html
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The above code should fix the visibility problems and make your webpage accessible again.