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Redhat9 ssh Remote X Display Can't Open under windows xp

I use ssh (PuTTY) to connect to a computer running Redhat Linux 9 (redhat9). The problem is that the remote display does not work.

$ xlogo
Error: Can't open display:

I used Xming server under windows xp, and under PuTTY "Enable X11 forwarding" was checked. I could ssh to other linux machines runing Fedora6, RHEL4, IRIX 6.5 with X display correctly. However, I just cannot get Redhat9 X display. I do not have other Redhat9 machine, therefore, I don't have any idea what was gone wrong.

Any thoughts?

The following is my env environment.

Code:

$ env

HOSTNAME=xxxxxxxx

PVM_RSH=/usr/bin/rsh

TERM=xterm

SHELL=/bin/bash

HISTSIZE=1000

SSH_CLIENT=xx.xxx.x.218 3798 22

QTDIR=/usr/lib/qt-3.1

SSH_TTY=/dev/pts/0

JAVA_OPTS=-Xms64M -Dfile.encoding=UTF-8

USER=xxx

LS_COLORS=no=00:fi=00:di=00;34:ln=00;36:pi=40;33:so=00;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:ex=00;32:*.cmd=00;32:*.exe=00;32:*.com=00;32:*.btm=00;32:*.bat=00;32:*.sh=00;32:*.csh=00;32:*.tar=00;31:*.tgz=00;31:*.arj=00;31:*.taz=00;31:*.lzh=00;31:*.zip=00;31:*.z=00;31:*.Z=00;31:*.gz=00;31:*.bz2=00;31:*.bz=00;31:*.tz=00;31:*.rpm=00;31:*.cpio=00;31:*.jpg=00;35:*.gif=00;35:*.bmp=00;35:*.xbm=00;35:*.xpm=00;35:*.png=00;35:*.tif=00;35:

PVM_ROOT=/usr/share/pvm3

MAIL=/var/spool/mail/xxx

PATH=/usr/kerberos/bin:/usr/java/j2sdk1.4.2_13/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/home/xxx/bin

INPUTRC=/etc/inputrc

PWD=/home/xxx

JAVA_HOME=/usr/java/j2sdk1.4.2_13

LANG=en_US.UTF-8

LAMHELPFILE=/etc/lam/lam-helpfile

SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass

SHLVL=1

HOME=/home/xxx

XPVM_ROOT=/usr/share/pvm3/xpvm

LOGNAME=xxx

CLASSPATH=.:/usr/java/custom

SSH_CONNECTION=xx.xxx.x.218 3798 xxx.xx.xx.99 22

LESSOPEN=|/usr/bin/lesspipe.sh %s

G_BROKEN_FILENAMES=1

_=/bin/env