7b7756fd_s_File_Sharing_and_FTP_Hosting__Purpose
[Range] 5xx [Purpose] 
Permanent Negative Completion Reply The command wasn’t accepted and the requested action didn’t occur. The User-process is discouraged from repeating the exact request (in the same sequence). Even some “permanent” error conditions can be corrected, so the human user may want to direct his User-process to reinitiate the command sequence by direct action at some point in the future (e.g., after the spelling was changed, or the user has altered his directory status.)
SmartFile | Business File Sharing and FTP Hosting
Purpose