Recommend OpenSource or Freeware tool to inspect network traffic between two servers

Question

I am currently in the process of locking down the network communication protocols that are available for use on given Windows application platform.

Can you suggest a freely available tool that will allow me to monitor/identify the commuications protocols that are in use i.e.

• TCP/IP
• http
• https
• FTP
• SFTP

Answer 1

Wireshark - this should do everything you need.

Answer 2

Apart from Wireshark already mentioned by Cybergibbons, you could use TCPDUMP.

Although Wireshark is way better for what you need.