Description: Test your firewall rule for free
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Use this service to test your firewall rules. If you intend to allow or deny connections through your firewall, you can check to see what will happen when an Internet user attempts to connect.
Behind the scenes, this firewall test uses NMap to attempt to connect to each specified port. The Nmap parameters used are: "-n -sT -p -Pn "
Select the TCP ports/services that you want to test. This server will attempt to connect to each port specified below.