Passive, or PASV is the data transfer process (DTP) for FTP establishes and manages the data connection. The DTP can be passive or active. PASV, is a command that requests that the server "listen" on a data port (which is not its default data port) and to wait for a connection rather than initiate one upon receipt of a transfer command. Certain FTP servers support both active and passive transfers while other FTP servers only allow active transfers.
Source: Adapted from RFC 959
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