|   | 1 |  initial version  | 
I bet you actually have a firewall running.
The only alternative is that another program has already bound port 8000, you can chcek with
 netstat  -p -l -n | grep 8000
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.