can not open remote apps (xterm from "creambo") on my desktop ("erez-dual")

here is the log:

[EMAIL PROTECTED] ~--> echo $SHELL
/bin/bash
[EMAIL PROTECTED] ~--> echo $DISPLAY
:0.0
[EMAIL PROTECTED] ~--> ip addr show eth0|grep 'inet\>'
   inet 172.20.1.20/24 brd 172.20.1.255 scope global eth0
[EMAIL PROTECTED] ~--> xhost +
access control disabled, clients can connect from any host
[EMAIL PROTECTED] ~--> xhost
access control disabled, clients can connect from any host
[EMAIL PROTECTED] ~--> ssh creambo
Last login: Wed Apr 18 17:12:03 2007 from 172.20.1.20
[EMAIL PROTECTED] ~--> echo $SHELL
/bin/bash
[EMAIL PROTECTED] ~--> export DISPLAY=172.20.1.20:0
[EMAIL PROTECTED] ~--> xterm
xterm Xt error: Can't open display: 172.20.1.20:0
[EMAIL PROTECTED] ~-->


"creambo" is centos4.0
"erez-dual" is ubuntu edgy
home dir is same on both (mounted from a common nfs server)
user is defined via nis server.

any idea ?

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