Try making a new database connection in Navicat using your external IP address for the host, and 3306 for the port. If that works, then it should prove that your external access stuff is setup properly and then we might need to look into it further why it isn't working for EOC. I suspect that your external access will not work, which would point to further issues on your end.
Most likely, you are running your server on Windows, and you did not enable remote DB access when you installed MySQL. If that is the case, then you should be able to go through the setup settings again like a new install of MySQL and check the box to allow remote connections when going through the setup.
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