What Is Passive FTP?
Passive FTP (File Transfer Protocol) involves the transfer of data via the FTP program client as opposed to the server. With passive FTP, the FTP program of safely organizes all data flow. Passive FTP permits files to travel between units as a result of the data ports being opened up by two separate computers.
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Function
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Passive FTP forces the FTP client to connect directly to the FTP servers, instead of making the Web host provide the return port. With passive FTP, users are capable of using their browsers as substitutes for FTP clients. This way the responsibility all is placed on the server, since the server is required to establish the remote connection.
Firewalls
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Firewalls operate to safely protect against any unknown and unsupervised access to the network of a computer. Specific configuration choices are often necessary to connect to the Web.
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Situations
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It can be helpful to be aware of when it is beneficial to employ passive FTP. Some examples of appropriate situations include a server not being able to host passive FTP connections or the server being situated being either a router or a firewall.
Other Options
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In some situations, neither passive nor active FTP work. These instances call for other actions, such as connecting with the server via SFTP (secure File Transfer Protocol), which generally does not encounter firewall issues. SFTP also, for the most part, does not encounter problems with NAT (network address translation) devices, which can sometimes occur with passive FTP and active FTP.
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References
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