Hopefully this will be of use for those who are deploying BioPortal on their own servers:
The BioPortal team is happy to announce some new changes that will ease the life of those who are deploying the BioPortal UI application in stand-alone instances. This should make it easier for you to upgrade BioPortal as we release new versions and lays down a framework for us to add new functionality without breaking your installations in the future. Previously, things like the autocomplete, found in the Jump To and Form Complete widgets, were hard-coded to use bioportal.bioontology.org as their AJAX back-end. That's no longer the case.