I have configured PHPMyAdmin on an Ubuntu Server to be accessible only from 127.0.0.1.
I am then trying to access it through an SSH tunnel, but I still obtain the Forbidden error.
When using SSH on the server, I can use Lynx to go to localhost/phpmyadmin; so I know it's working at least there.
The command I've used for the tunnel is
ssh -L 8080:mysite.com:80 localhost.