server returning ERR_CONNECTION_TIMED_OUT

hello, i follwed these https://www.vultr.com/docs/installing-nodejs-and-express-on-centos
instruction and successfully got the same results.

but when i type in my browser http://{my_servers_ip}:3000

the browser just shows an ERR_CONNECTION_TIMED_OUT error.
and i cant seem to figure out how to fix it
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