Currently I have a front end web server. When I hit http://frontendserver1:3000 I get the Stay Connected page appear.

Clicking on My Profile (in the image) works fine. Clicking on My Colleagues returns:
Internet Explorer cannot display the webpage

Looking at the URL of the site is has change to http://centaladminserver:3000/_layouts/MyContactLinks.aspx
centaladminserver is the wrong machine name. It should be centaladminserver1. Where would I change the settings to make the front end servers use that machine name?