Corkscrew (program)

Corkscrew is a lightweight program that is designed to facilitate the tunneling of network traffic through HTTP proxies. Primarily used in situations where a user needs to access TCP services (like SSH or FTP) that are normally blocked or filtered by a firewall, Corkscrew works by encapsulating this traffic within HTTP requests. The typical use case for Corkscrew is to allow connections to a remote server that is behind a restrictive firewall or proxy server.