Can't Open Display - X11 Forwarding - Cent OS

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http://serverfault.com – Trying to access X11 my CentOS 6 x32 small Linode VPS through Putty/Xming (enabled X11 forwarding on options). My windows machine is not the problem since it works with others CentOS Servers. X11Forwarding is enabled on /etc/ssh/sshd_config, still I can't get X11 forwarding. I'm trying to get xclock to work, but I get Can't open display :0.0 error. I've also tried with different $DISPLAY values like :0 or :10.0 I've tried MobaXterm, and I get this message when connecting: X11 forwarding request failed on channel 0 (HowTos)