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This is one of the modes a file transfer protocol (FTP) works. Inextended passive mode, the FTP server operates exactly the same as passive mode, however it only transmits the port number (not broken into high and low bytes) and the client is to assume that it connects to the same IP address that was originally connected to

This is defined in RFC 2428. One has to check the compatibility of both client and server while using this mode. It may be possible that some servers mandate the use of Extended Passive Mode (EPSV) in place of old Passive Mode (PASV). On the other hand, the clients may not provide EPSV mode feature.

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Q: Extended passive mode
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