永远的Express JS不监听外部IP

Question

I have uploaded my express js app to my VPS which has static IP.

My code that will listen to port and host is this:

app.listen(8888, "0.0.0.0");

Then I start it with forever:

forever start main.js

My page is accessible when I open it via localhost, when I try to open via external ip address it doesn't.

Did I miss something?

My iptables in Ubuntu Server 14.04 is this:

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     udp  --  anywhere             anywhere             udp dpt:bootpc
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:8888

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

The main interesting this is that I can access to this VPS remotely via SSH.

Answer 1

Do you have a firewall such as iptables? You may need to open your port 8888 if this is the case.

sudo iptables -A INPUT -p tcp --dport 8888 -j ACCEPT

Note that this rule will be lost when if your server is restarted. See https://askubuntu.com/questions/66890/how-can-i-make-a-specific-set-of-iptables-rules-permanent