EC2 TCP port Connection refused

Question

Hi,   
i have create a new instance (ID: i-0a9d6e25034d7c41a) and added a security group with a custom TCP port (7070) in inbound trafic.  
nothing happens. The port is still blocked.  
Im running UFW behind, and having allowed 7070 port too.  
  
To                         Action      From  
--                         ------      ----  
.......  
7070                       ALLOW       Anywhere  
7070 (v6)                  ALLOW       Anywhere (v6)  
  
#######################  
{ Error: listen EADDRNOTAVAIL {IP}:7070  
at Server.setupListenHandle \[as _listen2] (net.js:1269:19)  
at listenInCluster (net.js:1334:12)  
at doListen (net.js:1460:7)   
at process._tickCallback (internal/process/next_tick.js:63:19)   
at Function.Module.runMain (internal/modules/cjs/loader.js:744:11)  
at startup (internal/bootstrap/node.js:285:19)  
at bootstrapNodeJSCore (internal/bootstrap/node.js:739:3)   
errno: 'EADDRNOTAVAIL',  
code: 'EADDRNOTAVAIL',  
syscall: 'listen',                                                                                                  
address: '{IP}',                                                                                            
port: 7070 }  
  
Thank you.

Answer

Hi,  
  
Doing a quick test to the IP address of your instance on that port I can see that it is giving a connection refused.

```
[ec2-user ~]$ nc -vz 18.207.237.18 7070
nc: connect to 18.207.237.18 port 7070 (tcp) failed: Connection refused
```

There are two possible scenarios here, the application you are using is not listening on this port or your firewall is still refusing the connections.  
  
You can see if your application is in fact running and listening on that port by running the following command.

```
 sudo netstat -tulpn
```

EC2 TCP port Connection refused

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