Why Supervisor's http server won't wok?

I've installed Supervisor in a ubuntu based vps, and it takes effect on starting other processes. But I can't visit it's monitor page from ip:9001 in browser. I config inet_http_server in /etc/supervisor/supervisord.conf:

[inet_http_server]
port = 127.0.0.1:9001
username = user
password = 123

Also tried port ":9001" or "0.0.0.0:9001", and execute sudo service supervisor restart; sudo supervisorctl reload after each configuration. But I can't visit ip:port from local browser, and when I check netstat -anp | grep 9001 in the server, no process is found.

Did you put a * before 9001?

This is what works for me:

[inet_http_server]         ; inet (TCP) server disabled by default
port=*:9001        ; (ip_address:port specifier, *:port for all iface)
; username=user              ; (default is no username (open server))
; password=123               ; (default is no password (open server))

make sure you aren't using HTTPS to connect from the browser!

Just make sure your config has taken effect by issuing the following command:

supervisord -c /etc/supervisor/supervisord.conf

(in the case that the config section [inet_http_server] is included in your /etc/supervisor/supervisord.conf file)

simply change

port = 127.0.0.1:9001

to

port = 9001

not sure why most people will add IP addr for the port variable, but this will work