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Could not access to my application in digital ocean through public IP?

Posted February 19, 2020 520 views

Hi, I faced an issue regarding the ufw ubuntu firewall rule in digital ocean, I already allow the port in in from anywhere but still I can not access to my application with public ip with the port that I allowed. How to allow the ufw firewall rule for my application in secure ways. Thank you. Event I try to disable the ufw from ubuntu, still I can not access my application through public IP address.

Rule:
To Action From

22 ALLOW Anywhere
8080 ALLOW Anywhere
3000 ALLOW Anywhere
27017/tcp ALLOW Anywhere
22 (v6) ALLOW Anywhere (v6)
8080 (v6) ALLOW Anywhere (v6)
3000 (v6) ALLOW Anywhere (v6)
27017/tcp (v6) ALLOW Anywhere (v6)

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jonhzono
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1 answer
alexdo February 20, 2020

Hello, @jonhzono

Could you also please make sure that your application is running/listening on the port as well? You can check this using netstat:

netstat -plunta | grep PORT

If UFW is disabled and you still can’t access your application then it might be something else that is preventing you from loading your application.

If you can see that the service is up and running on the specified port then you can check if the service is also visible from outside the droplet by using nmap:

nmap -PN DropletIP

https://www.digitalocean.com/community/tutorials/how-to-use-nmap-to-scan-for-open-ports-on-your-vps

Let me know how it goes.

Regards,
Alex

How To Use Nmap to Scan for Open Ports on your VPS
by Justin Ellingwood
Nmap is a great tool for discovering the network services and ports that your server is exposing to the network. In this guide, we will discuss some basic information about networking ports and how you can use nmap to find your weaknesses.
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