Error: Another program is already listening on a port that one of our HTTP servers is configured to use. Shut this program down first before starting supervisord.
StackOverflow http://serverfault.com/questions/114477/supervisor-http-server-port-issue
sudo unlink /tmp/supervisor.sock
sudo unlink /var/run/supervisor.sock
This .sock file is defined in /etc/supervisord.conf's [unix_http_server]'s file config value (default is /tmp/supervisor.sock or /var/run/supervisor.sock).
Hope this helps someone in the future.
