Inbound Traffic Blocked, Check Firewall Settings Best -

If the service is not listening on the expected port, the firewall isn’t the issue. Linux (iptables / nftables / firewalld / ufw) Using iptables (legacy):

If problems persist, check for conflicting VPNs, proxy settings, or SELinux (Linux) which can also deny network access independently of the firewall.

sudo pfctl -s rules Disable temporarily: inbound traffic blocked, check firewall settings

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

The firewall is blocking the incoming (inbound) traffic. If the service is not listening on the

Temporarily disable the firewall to confirm the issue (do not do this in production).

sudo iptables -L -n -v Look for a default policy of DROP or REJECT on the INPUT chain. Example blocking line: Temporarily disable the firewall to confirm the issue

# Test TCP port nc -zv <target-ip> <port> telnet <target-ip> <port> Test with curl (HTTP) curl -v http://<target-ip>:<port>