Is it possible to run OpenERP on an internal network that does not have connection to the internet?

I have installed OpenERP on an internet-connected machine for evaluation purposes. However, when accessing it with Firefox 28, Firebug shows that the application is often going to apps.openerp.com. When I have it installed on an internal network, that will not work.

So, is there somewhere that I can configure the system not to try to go to the internet?

Ivan