If you ask a bunch of systems administrators what tools do they use when troubleshooting remote services and ports, one of the top answers would definitely be the Telnet client! Windows 7 includes a Telnet Client but it is not installed by default. However, a tool that is more flexible and powerful than Telnet Client is PortQry. This tool has been around since Windows 2000 and version 2 has more features, you can download PortqryV2.exe from Microsoft’s Download Center as it is not included with Windows 7.
Netstat displays protocol statistics and current TCP/IP network connections. With Netstat you can collect connection statistics about the names of the protocols (TCP or UDP) used, the IP addresses of both local and remote computers, the ports used for both local and remote computers and the state of TCP connections.