Ok, I just tried a fifth time...
Here is the error message- copy&pasted:
http://gnosticteachings.org/forum.html?controller=posts&task=submit
Forbidden
You don't have permission to access /forum.html on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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Perhaps one of the techies can look into it