Server Side Commands
FTP 7.5 accepts the following FTP commands.
214-The following commands are recognized (* ==>'s unimplemented). ABOR ACCT ADAT * ALLO APPE AUTH CCC CDUP CWD DELE ENC * EPRT EPSV FEAT HELP HOST LANG LIST MDTM MIC * MKD MODE NLST NOOP OPTS PASS PASV PBSZ PORT PROT PWD QUIT REIN REST RETR RMD RNFR RNTO SITE SIZE SMNT STAT STOR STOU STRU SYST TYPE USER XCUP XCWD XMKD XPWD XRMD 214 HELP command successful.
FTP shipped for IIS 6 supports a shorter list of commands,
214-The following commands are recognized(* ==>'s unimplemented). ABOR ACCT ALLO APPE CDUP CWD DELE FEAT HELP LIST MDTM MKD MODE NLST NOOP OPTS PASS PASV PORT PWD QUIT REIN REST RETR RMD RNFR RNTO SITE SIZE SMNT STAT STOR STOU STRU SYST TYPE USER XCUP XCWD XMKD XPWD XRMD 214 HELP command successful.
Client Side Commands
FtpWebRequest.Method accepts the following commands based on WebRequestMethods.Ftp documentation.
RETR NLST LIST STOR STOU APPE DELE MDTM SIZE RENAME MKD RMD PWD
(in fact if you use FtpWebRequest/FtpWebResponse to develop an FTP application, you will see other commands from the conversation. That’s because they are embedded in the underlying code).
How To Check Which Command Supported By Server
To see what commands are supported by an FTP server, you can
Actually when we use remotehelp here, ftp utility translates that to a HELP command and send to the server.
You can try to use “literal HELP” in ftp context. Of course, the same information is printed out.
FTP 7.5 introduces full support to FTP over SSL (FTPS). However, FtpWebRequest class available in .NET Framework does not (though it covers some scenarios).
If you need to develop a full FTPS capable client software with .NET, I suggest you visit this open source project.