This is how you can connect to a MySQL or Percona server using Navicat ( http://www.navicat.com/en/download/download.html )
The MySQL or Percona machine is configured to listen on the private interface. You'll want to make sure you're using that IP address for the mysql connection in addition to using the ssh tunnel connection.
Below are screenshots of the relevant configuration windows for Navicat.
On the "general" tab for the connection in Navicat, make sure you're using the password for "mysql" for this machine and the username "root".