X in Debian by default uses -nolisten tcp, why is it open?
Also, read the XSecurity man page-- just because the port is open does not mean it is accessible.
However, you should as a rule disable anything that listens to the internet if you don't need it. You should also, if possible, use host-based access control.
Adding a firewall will only help things, and it certainly can't hurt. Why not run one if you're unsure? Shorewall is a nice iptables front-end.
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