Temporarily disable the firewall to confirm the issue (do not do this in production).
If problems persist, check for conflicting VPNs, proxy settings, or SELinux (Linux) which can also deny network access independently of the firewall. inbound traffic blocked, check firewall settings
sudo ufw status verbose If inactive, enable it with sudo ufw enable . If active, check for rules like Deny from any or missing Allow rules for your port. Temporarily disable the firewall to confirm the issue