Issue Port 3000 is closed and not listening

[maczad]

I installed plesk on ubuntu, my project works with port 3000 and other ports which needs to be enabled and also listens, but i am finding it difficult to find out how to really open it and get it to listen. Here is what i have tried:

1. Using sudo ufw allow 3000 directly from ssh
2. Enabling firewall and allowing on ports on plesk
3. Using iptables to add ports. ( When i type in iptables list, it shows that the ports i added are there but when i type in the listening ports, my added ports isn’t included)

My ports are currently added but how do i get them to listen or is there something i’m not doing right

 

[Dave W]

You need a service listening on a port before you can connect to it. Assuming you are using Linux you can check this with the ss -lntp | less command.

 

[maczad]

You need a service listening on a port before you can connect to it. Assuming you are using Linux you can check this with the ss -lntp | less command.

I have an android and ios application that i pointed to listen to mydomain.com:3000 but it keeps failing to connect each time i try to access my app. . When ou say i need a service listening on a port, what kind of service do you mean?

 

[maczad]

I have an android and ios application that i pointed to listen to mydomain.com:3000 but it keeps failing to connect each time i try to access my app. . When ou say i need a service listening on a port, what kind of service do you mean?

You need a service listening on a port before you can connect to it. Assuming you are using Linux you can check this with the ss -lntp | less command.

I have my nodejs on port 3000, isn't that a service?

 

[Martin Dias]

is that nodejs app running correctly on the port?

netstat -tulpen | grep :3000

 

[maczad]

is that nodejs app running correctly on the port?

netstat -tulpen | grep :3000

When i type in netstat -tulpen | grep :3000 on ssh, it doesn't show anything

 

[Martin Dias]

then you have nothing on the server running on it, since it would show it like this:

# netstat -tulpen | grep :80
tcp        0      0 127.0.0.1:80            0.0.0.0:*               LISTEN      0          84096210   25418/nginx: worker
tcp        0      0 192.168.1.10:80         0.0.0.0:*               LISTEN      0          84096209   25418/nginx: worker

 

[maczad]

is that nodejs app running correctly on the port?

netstat -tulpen | grep :3000

public static final String SITE_URL = "https://mydomain.com"; // site main url
 public static final String API_URL = SITE_URL + ":3000/"; // base url for all api
 public static final String APPRTC_URL = "http://IPADDRESS:8080";
 public static final String CHAT_SOCKET_URL = "wss://mydomain.com:8087/";


 /**
  * For publish and subscribe
  */
 public static final String SOCKET_IO_URL = SITE_URL + "8082";//Port number

 /**
  * Dynamic Link Share URL
  */
 public static final String APP_SHARE_URL = SITE_URL;

This is how my constant.java on android looks like, it is suppose to connect to my ports i've added on my server but it doesn't

 

[Dave W]

If you do not have a service on your server listening on port 3000 then your android app will not connect.