Can not connect to web interface

I recently installed Proxmox to my test server (a Dell Poweredge 2950) to try it out and see if it would work as a replacement for Virtualbox. I was having issues burning it to a USB and a CD so I followed this tutorial
http://pve.proxmox.com/wiki/Install_..._Debian_Wheezy
I get an "unable to connect" error in Firefox when trying to access the web interface.
I have only ever used Ubuntu before so I am new to Debian.
Any help would be appreciated.