Hi there @mujti28,

Can you share a little bit more information like which firewall exactly are you using? Is it a DigitalOcean Cloud Firewall or a firewall on your Droplet like UFW or iptables?

If you are using Ubuntu and the Ubuntu firewall, I would recommend following the steps from this tutorial on how to configure ufw:

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-18-04

If you are using DigitalOcean Cloud Firewall I would recommend following the steps from the documentation here:

https://www.digitalocean.com/docs/networking/firewalls/how-to/configure-rules/

Hope that this helps!
Regards,
Bobby