If you are accessing your droplet via the IP address but seeing a registrar parking page then it is likely that your web application is configured to redirect traffic to the domain name you had it configured with. This will need to be corrected at the application level. If you are using wordpress for instance you would need to modify the site name specified in the settings to use the IP address rather than the domain.

Hum… I don’t think it is setup like a wordpress as it is a Ruby on rails + Backbone.js custom app and we don’t have any setting for the domain inside the app (I could be wrong though).

Thank you anyway Ryan.

So beside adding a new PTR with a different domain name, for the moment I don’t see any other solution (change of droplet?)