Ubuntu Networking :: Ssh X Forwarding Not Setting Display?

At home, I am running Ubuntu 10.04.1 LTS with openssh server OpenSSH_5.3p1 Debian-3ubuntu5 In my office, we are using CentOS 5.5 with openssh OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 Both my /etc/ssh/sshd_config at home and my ~/.ssh/config has X forwarding enabled.When I log in to my home machine from my office with ssh -X -vv host, I got the following:

Code:

debug2: x11_get_proto: /usr/bin/xauth list :0.0 2>/dev/null
debug1: Requesting X11 forwarding with authentication spoofing.
debug2: channel 0: request x11-req confirm 0

But once I log in, I get:

Code:

home:~>echo $DISPLAY
DISPLAY: Undefined variable.

I tried setting DISPLAY to localhostx.0 (xx from 0 to 10) but none of that works. I have also tried ssh -Y but the result is the same.