Inbound Traffic Blocked, Check Firewall: Settings 2021

# Linux / macOS sudo netstat -tulpn | grep LISTEN # or ss -tuln netstat -an | findstr "LISTENING"

# Test TCP port nc -zv <target-ip> <port> telnet <target-ip> <port> Test with curl (HTTP) curl -v http://<target-ip>:<port> inbound traffic blocked, check firewall settings

Chain INPUT (policy DROP)

If the service is not listening on the expected port, the firewall isn’t the issue. Linux (iptables / nftables / firewalld / ufw) Using iptables (legacy): # Linux / macOS sudo netstat -tulpn |