Hi there @appengineers4u,

It would depend on what Firewall you are using. For example if you are using ufw you can do that with the following command:

sudo ufw allow 37000

If you are using CSF, you can do that by editing your /etc/csf/csf.conf configuration file, find the TCP_IN line and add the port at the end of the list. Finally, restart your firewall with:

sudo csf -r

If you are using a DigitalOcea Cloud Firewall, you can take a look at the steps here on how to do that:

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

Hope that this helps!
Regards,
Bobby