201 Chapter 15. SOCKS · · · · · SOCKS V4 and SOCKS V5 SOCKSified Applications SOCKSCap How to Get SOCKS SOCKS Support SOCKS V4 and SOCKS V5 SOCKS is a protocol that can be used to create proxy connections through a firewall. Originally developed by David Koblas and Ying-Da Lee at NEC Systems Laboratory, SOCKS has been made a standard by a number of Request for Comments (RFC) documents and is widely used on the Internet. The SOCKS protocol can be used to allow a host on one side of the SOCKS server to interact with a host on the other side, subject to authentication, without passing IP packets directly