TCP Port check tool - WireShark

http://www.wireshark.org/download.html

Wireshark is a network analysis tool that captures packets in real time and display them in human-readable format. Wireshark includes filters, color-coding and other features that let you dig deep into network traffic and inspect individual packets.

Capturing Packets

After downloading and installing Wireshark, you can launch it and click the name of an interface under Interface List to start capturing packets on that interface. For example, if you want to capture traffic on the wireless network, click your wireless interface. You can configure advanced features by clicking Capture Options, but this isn’t necessary for now.

Click the link below to see a detailed user manual

http://www.howtogeek.com/104278/how-to-use-wireshark-to-capture-filter-and-inspect-packets/