If you run into the following error with  system-config-firewall.py

File "/usr/share/system-config-firewall/system-config-firewall.py", line 29, in <module>
os.execv(argv[0], argv)
OSError: [Errno 2] No such file or directory

You can solve this by opening  /usr/share/system-config-firewall/system-config-firewall.py

 and editing the following:

argv = [ "/usr/sbin/system-config-firewall-tui" ]
to
argv = [ "/usr/bin/system-config-firewall-tui" ]

And try again. That should work...

 Great Job on this article. Top Notch!