详细的FTP错误列表
110 Restart marker reply. In this case, the text is exact and not left to the particular implementation; it must read: MARK yyyy = mmmm where yyyy is User-process data stream marker, and mmmm server's equivalent marker (note the spaces between markers and 重新启动标志回应。这种情况下，信息是精确的并且不用特别的处理；可以这样看：标记 yyyy = mmm 中 yyyy是 用户进程数据流标记，mmmm是服务器端相应的标记（注意在标记和等号间的空格）
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120 Service ready in nnn minutes.
服务在NNN时间内可用
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125 Data connection already open; transfer starting.
数据连接已经打开，开始传送数据.
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150 File status okay; about to open data connection.
文件状态正确，正在打开数据连接.
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200 Command okay.
命令执行正常结束.
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202 Command not implemented, superfluous at this site.
命令未被执行，此站点不支持此命令.
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211 System status, or system help reply.
系统状态或系统帮助信息回应.
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212 Directory status.
目录状态信息.
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213 File status. $XrkxmL=
文件状态信息.
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214 Help message.On how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user. 帮助信息。关于如何使用本服务器或特殊的非标准命令。此回复只对人有用。
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215 NAME system type. Where NAME is an official system name from the list in the Assigned Numbers document.
NAME系统类型。
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220 Service ready for new user.
新连接的用户的服务已就绪
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221 Service closing control connection.
控制连接关闭
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225 Data connection open; no transfer in progress.
数据连接已打开，没有进行中的数据传送
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226 Closing data connection. Requested file action successful (for example, file transfer or file abort).
正在关闭数据连接。请求文件动作成功结束（例如，文件传送或终止）
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227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).
进入被动模式
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230 User logged in, proceed. Logged out if appropriate.
用户已登入。 如果不需要可以登出。
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250 Requested file action okay, completed. _
被请求文件操作成功完成 63
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257 "PATHNAME" created.
路径已建立
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331 User name okay, need password. ,
用户名存在，需要输入密码
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332 Need account for login.
需要登陆的账户
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350 Requested file action pending further inFORMation U
对被请求文件的操作需要进一步更多的信息
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421 Service not available, closing control connection.This may be a reply to any command if the service knows it must shut down. (O&;
服务不可用，控制连接关闭。这可能是对任何命令的回应，如果服务认为它必须关闭
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425 Can't open data connection.
打开数据连接失败
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426 Connection closed; transfer aborted.
连接关闭，传送中止。
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450 Requested file action not taken.
对被请求文件的操作未被执行
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451 Requested action aborted. Local error in processing.
请求的操作中止。处理中发生本地错误。
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452 Requested action not taken. Insufficient storage space in system.File unavailable (e.g., file busy).
请求的操作没有被执行。 系统存储空间不足。 文件不可用
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500 Syntax error, command unrecognized. This may include errors such as command line too long..
语法错误，不可识别的命令。 这可能是命令行过长。
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501 Syntax error in parameters or arguments.
参数错误导致的语法错误
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502 Command not implemented.
命令未被执行
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503 Bad sequence of commands. )
命令的次序错误。
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504 Command not implemented for that parameter.,
由于参数错误，命令未被执行
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530 Not logged in.
没有登录
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532 Need account for storing files.
存储文件需要账户信息!
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550 Requested action not taken. File unavailable (e.g., file not found, no access).
请求操作未被执行，文件不可用。
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551 Requested action aborted. Page type unknown. +.+
请求操作中止，页面类型未知
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552 Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
对请求文件的操作中止。 超出存储分配
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553 Requested action not taken. File name not allowed
请求操作未被执行。 文件名不允许
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这种错误跟http协议类似，大致是：
2开头－－成功 A/
3开头－－权限问题
4开头－－文件问题
5开头－－服务器问题
例如下面这个例子：
Sat Feb 15 00:13:02 2003 正在连接 61.143.241.231 [IP=61.143.241.231:21]
Sat Feb 15 00:13:02 2003 Socket已连接 ,等待欢迎信息
Sat Feb 15 00:13:03 2003 220 www.DFBBS.COMfree Ftp Server 231
Sat Feb 15 00:13:03 2003 USER ftper
Sat Feb 15 00:13:03 2003 331 Password required for ftper.
Sat Feb 15 00:13:03 2003 PASS ********
Sat Feb 15 00:13:03 2003 530 Login incorrect.
Sat Feb 15 00:13:03 2003 有错误发生!
Sat Feb 15 00:13:03 2003 等待 5秒后重试