When troubleshooting network access, start with the basics: confirm the service is running, confirm it is listening on the expected interface and port, and confirm the firewall allows the traffic you expect.
- Check local firewall rules on the server.
- Confirm the application is listening on the right port.
- Verify the correct public IP or hostname is in use.
- Review any provider-side security controls that apply.
- Test from another network to rule out local filtering.
Many network problems come down to either the wrong port, the wrong bind address, or a firewall rule that was forgotten.