If no records in nginx log (access.log & error.log), two things to check first firewall and firewall! If logs showing hits with errors, then you start from that point.

Check your DO firewall settings. An Introduction To DigitalOcean Cloud Firewalls

Second is your linux firewall, if enabled.

You can test using online tool for ports i.e. Is Port Open

Hello, @revistagarupa

You can check if there is any service listening on this port using ‘netstat’

netstat -plunta | grep 8888

If there is no configured service on this port but the port is used as a socket you can also do a curl or telnet on the port and see if a connection can be established.

telnet DropletIP port

curl DropletIP:1234

If the connection can not be established then the issue is most likely related to your Firewall configuration.

Hope that this helps!
Regards,
Alex