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SOCKS is a networking proxy protocol that enables hosts on one side of SOCKS server to gain full access to hosts on the other side of the SOCKS server without requiring direct IP reachability. SOCKS redirects connection requests from hosts on opposite sides of a SOCKS server. The SOCKS server authenticates and authorizes the requests, establishes a proxy connection, and relays data.
SOCKS is commonly used as a network firewall that enables hosts behind a SOCKS server to gain full access to the Internet, while preventing unauthorized access from the Internet to the internal hosts.

There are two major versions of SOCKS: SOCKS V4 and SOCKS V5.