VNC Server won't start

[Jamina1]

I have xubuntu running on a "headless" machine and about a month ago is the last time I needed to log on to do anything to it.

Today, i try to start firefox inside the vnc server and it fails.
I tried some other programs too and they don't work either. What gives?

administrator@lamp:~$ tightvncserver

New 'X' desktop is lamp:1

Starting applications specified in /home/administrator/.vnc/xstartup
Log file is /home/administrator/.vnc/lamp:1.log

administrator@lamp:~$ firefox -display lamp:1
Error: no display specified

[Nxion]

I have xubuntu running on a "headless" machine and about a month ago is the last time I needed to log on to do anything to it.

Today, i try to start firefox inside the vnc server and it fails.
I tried some other programs too and they don't work either. What gives?

administrator@lamp:~$ tightvncserver

New 'X' desktop is lamp:1

Starting applications specified in /home/administrator/.vnc/xstartup
Log file is /home/administrator/.vnc/lamp:1.log

administrator@lamp:~$ firefox -display lamp:1
Error: no display specified

Has this setup work in the past? trying to open Firefox this way?