概括：FTP服务器不需要用户名和密码访问时，就是匿名访问，用户名使用anonymous 密码为空直接回车
以下为示例
C:\Users\user>ftp
ftp> open ftp.cmegroup.com
连接到 ftp.cme.akadns.net。
220-This system is for authorized CME Group users only.
220-
220-Individuals using or accessing this system are subject to having all 002
220-activities on this system monitored, logged and/or recorded.
220-Anyone using or accessing this system expressly consents to such
220-monitoring, logging and/or recording and is advised that if such
220-monitoring, logging and/or recording reveals possible evidence of criminal
220-activity, improper usage or hacking, systems personnel
220-may provide the evidence of such monitoring, logging and/or recording to
220-management, governmental authorities and/or any other
220-third parties. Any attempted hacking or use of hacking tools on this
220-machine (or any other associated or related system) will
220-be pursued under corporate guidelines as well as under all applicable
220-federal, state and local laws and regulations.
220-
220-
220
200 Always in UTF8 mode.
用户(ftp.cme.akadns.net:(none)): anonymous
331 Please specify the password.
密码:
230 Login successful.
ftp> cd settle
250 Directory successfully changed.
ftp> get nymex.settle.20160728.s.txt.zip
200 PORT command successful. Consider using PASV.
150 Opening ASCII mode data connection for nymex.settle.20160728.s.txt.zip (1431832 bytes).
226 Transfer complete.
ftp: 收到 1434440 字节，用时 28.34秒 50.62千字节/秒。
ftp> bye
221 Goodbye.
本文出自 “小蚂蚁找对象” 博客，请务必保留此出处http://19840202.blog.51cto.com/24728/1832903
原文：http://19840202.blog.51cto.com/24728/1832903