You could try going into the jetty configuration file and commenting out the line that looks like this:
Code:
<Set name="host">127.0.0.1</Set>
On my windows machine this is located at
Code:
%localappdata%\Zimbra\Zimbra Desktop\jetty\etc
But it might be different for you depending on your OS, and which version of ZD you are running.
After making that change you might be able to access it by using the link you get from going to setup and clicking "open in web browser", and then replacing the 127.0.0.1 with the internal IP address.