sudo firewall-cmd --list-all Check the services and ports sections. If your port is missing, inbound traffic is blocked.
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. inbound traffic blocked, check firewall settings
Get-NetFirewallRule | Where-Object $_.Direction -eq 'Inbound' -and $_.Enabled -eq 'True' | Format-Table DisplayName, Action Use with caution; only for testing. sudo firewall-cmd --list-all Check the services and ports
sudo iptables -L -n -v Look for a default policy of DROP or REJECT on the INPUT chain. Example blocking line: Action Use with caution
# Test TCP port nc -zv <target-ip> <port> telnet <target-ip> <port> Test with curl (HTTP) curl -v http://<target-ip>:<port>