FTP發生500 'RE*T': command not understood怎麼解？

[chelen]

STATUS:> Connecting to [FTP Server Ip](ip = XXX.XXX.XXX.XXX)
STATUS:> Socket connected. Waiting for welcome message...
220 Serv-U FTP Server v4.0 for WinSock ready...
STATUS:> Connected. Authenticating...
COMMAND:> USER XXX
331 User name okay, need password.
COMMAND:> PASS XXXXXX
230 User logged in, proceed.
STATUS:> Login successful
COMMAND:> TYPE I
200 Type set to I.
COMMAND:> REST 100
500 'RE*T': command not understood.
COMMAND:> REST 0
500 'RE*T': command not understood.
STATUS:> This site cannot resume broken downloads

[tvirus]

無解
對方站台FTP Server就是不支援該命令