PROBLEM Forbidden You don't have permission to access this resource

[Felix]

Hello Eric,

Welcome to GS 3.3.16
Would you like to mention something more about your website,
we are there to help and share experience.

The -- Forbidden You don't have permission to access this resource -- error
is most probably the mod_security setting on your hosting

Disable mod_security in the CPanel of your hosting
or disable it in the .htaccess file in the root of your website

If the error disappears then contact your hosting support
and let them adjust the mod_security settings for your website.

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Just let us know it that solved the issue.
If not we can further diagnose the case.

F.