open port 6001

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Author: MikeStarkemgcon@neta.com
Date:  
Subject: open port 6001
I just did a nmap on one of my routers (cisco 2500) and there is
one line that I cannot explain:

6001    open    tcp    X11:1


What is this? How can I close this if not needed?

Mike

http://www.getnet.com/~mgcon
Phoenix, AZ
USA