Port Listener for firewall testing

I found this cool little tool today for testing ports open through a firewall.  In my lab, I’m trying to simulate my pfsense firewall and it’s a pain to setup a box as a mail server, an http server, an ftp server, an https server, etc… just so that I can test each rule.  This little utility runs and lets you pick a port to “listen” on.  Then to test, say port 25, just run a “telnet 10.1.1.1 25” and you’ll get a “Hello” response if the port is active.  Simple, effective and elegant tool to add to your toolbox.

Port Listener v1.01