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The FTP/S EPSV command signals a request for Extended Passive Mode, enhancing connectivity for FTP/S clients, especially behind firewalls.
2014/8/22 -The only difference is that PORT/PASV are limited to IPv4, while EPRT/EPSV work with any network protocol (although only IPv6 is used in practice).
This command tells the server to enter a passive FTP session rather than Active. This allows users behind routers/firewalls to connect over FTP.
To transfer data in passive mode, the FTP server must obtain a port from the PASSIVEDATAPORTS range. Therefore, allow at least one port per simultaneous ...
2009/4/14 -In a passive mode, the FTP server opens a random port (> 1023), sends the FTP client the server's IP address to connect to and the port on ...
2019/4/25 -I'm trying to set up FTP server in Java on my local network via Wi-Fi. And I'm stuck with handling EPSV ALL command. As a client I use VLC player on iPhone.
2022/1/13 -The PASV FTP command and EPSV commands (What is Extended Passive Mode?) commands are both used in passive mode. EPSV is used by modern client/ ...
When the server receives a PASV or EPSV command, it opens a listening socket. Any entity can connect to the listening socket.
2020/2/26 ---ftp-pasv is the default behavior of curl and asks to do the FTP transfer in passive mode. As this is the default, you will rarely see this option used.
Using EPSV means that libcurl first attempts to use the EPSV command before using PASV. If you pass zero to this option, it does not use EPSV, only plain PASV.