remote X server display not working

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http://serverfault.com – I have a local machine A, and a server B. from A, I got: #ps -ef root 3161 3160 0 09:07 tty1 00:03:04 /usr/bin/Xorg :0 -nr -verbose -auth /var/run/gdm/auth-for-gdm-dJExDH/database vt1 #netstat -nltu tcp 0 0* LISTEN - #xhost + access control disabled, clients can connect from any host A's ip address is From B, I trid: #export DISPLAY= #xclock Xlib: connection to "" refused by server Xlib: No protocol specified Error: Can't open display: I ha (HowTos)