Common FTP, FTPS & SFTP Error Codes and What They Mean
When working with file transfer protocols like FTP, FTPS, and SFTP, servers send and receive various return codes during sessions. Some codes indicate successful file transfers, while others signal errors and require further action. And when things go wrong, understanding the meaning behind the sever return codes can save you and your team time, money and frustration.
It may be obvious to some that FTP (File Transfer Protocol) is an insecure protocol; and that its continued use for transferring sensitive or personal is inappropriate. Yet, its use for that very purpose still continues according to Rapid7, creating an unnecessary risk.
For a protocol with nearly fifty years on the clock, FTP can sometimes be a lot more complicated than most would assume. In particular, there is often a strong misunderstanding of the differences between active and passive FTP sessions, which can lead to confusion around port numbers in use and how the protocol really works. So what are the differences between active and passive FTP; and what are the advantages and disadvantages of using either mode?
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