tcping.exe is a small console application that operates similarly to ‘ping’, however it works over a tcp port. License: GPL - Platforms: Win XP, Vista 7

When I have to test if a TCP connection works, like when configuring a NAT or ACL rule, usually I telnet the specific port. TCPing allows to keep the ping active on the port to check when the rule works:

<img src="https://www.ifconfig.it/images/tcping.png" alt="">