Tracking Sites hosted Externally with an Internal Piwik Server

Hello,

We currently have a public facing website (www.example.com) that we are hosting with a piwik instance on the same internal network. We are able to successfully track the access of that website. We are now planning to have a third party host some of the info on their site (example.public.com). The piwik server is accessible by the internet. Can we just add the same tracking code to the footer of the info site pages? We tried that, but i’m not able to see any traffic.

Thank you.