The server doesn't implement a 'put' command, the client does.
The supported() method is for checking what RAW commands the server supports.

Things like these:
The following commands are implemented.
   USER    EPRT    STRU    ALLO    DELE    SYST    RMD     MDTM
   PASS    EPSV    MODE    REST    CWD     STAT    PWD     PROT
   QUIT    LPRT    RETR    RNFR    LIST    HELP    CDUP    PBSZ
   PORT    LPSV    STOR    RNTO    NLST    NOOP    STOU    AUTH
   PASV    TYPE    APPE    ABOR    SITE    MKD     SIZE

[download]
Let me update:

To be more specific and make more sense, the supported() method checks if the server supports the actual *raw* command. See this link: FTP Command Aliases

In reply to Re^3: Net::FTP failure by kabeldag
in thread Net::FTP failure by wow_za_

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