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1.
以下為引用的內(nèi)容：
Connected. Waiting for response.
220 Serv-U FTP Server v4.0 for WinSock ready...
USER anonymous
530 Sorry, no ANONYMOUS access allowed.
QUIT |
這個(gè)就是不許匿名登錄啦
2.
以下為引用的內(nèi)容：
Connected. Waiting for response.
220 Serv-U FTP Server v4.0 for WinSock ready...
USER test
331 User name okay, need password.
PASS xxxxxx
530 Not logged in.
QUIT |
一般是密碼輸入錯(cuò)誤時(shí)出現(xiàn)的信息，但對(duì)于Serv-U來說，如果沒有這個(gè)帳號(hào)（test）存在，也會(huì)產(chǎn)生同樣的出錯(cuò)信息。
3.
Connecting to xxx.xxx.xxx.xxx, Port 21 (#1)
ERROR: Connection timed out
這個(gè)表明對(duì)方未開機(jī)，也可能是對(duì)方不在你能訪問的范圍內(nèi)
4.
Connecting to xxx.xxx.xxx.xxx Port 21 (#1)
ERROR: Connection refused
這個(gè)一般表明對(duì)方已開機(jī)，但未開啟FTP服務(wù)（沒有開Serv-U）
也可能為對(duì)方不提供在這個(gè)端口上的服務(wù)
5.
以下為引用的內(nèi)容：
Connecting to xxx.xxx.xxx.xxx, Port 21 (#1)
Connected. Waiting for response.
Disconnected from server.
Connection attempt failed. Waiting for retry... |
出現(xiàn)這個(gè)信息實(shí)在是很倒霉，你極有可能被對(duì)方Ban了。
如果只是Ban幾分鐘or幾小時(shí)or一天還好，不然只有和站長說說好話，讓他給你解封吧。
6.
以下為引用的內(nèi)容：
Connecting to xxx.xxx.xxx.xxx, Port 21 (#1)
Connected. Waiting for response.
USER XXX
331 User name okay, need password
PASS xxxxxx
530 Not logged in, unauthorized IP address.
QUIT |
這個(gè)有點(diǎn)麻煩，你的IP不在站長允許訪問的IP范圍內(nèi)，只有和站長聯(lián)系，讓他把你的IP網(wǎng)段加入Allow Access列表里吧
7.
以下為引用的內(nèi)容：
Connected. Waiting for response.
220 Serv-U FTP Server v4.0 for WinSock ready...
USER user
421 Too many users - please try again later. |
哈哈，這個(gè)很常見吧，用戶太多，去過交大的都知道該怎么做
8.
以下為引用的內(nèi)容：
Connected. Waiting for response.
220 Serv-U FTP Server v4.0 for WinSock ready...
USER test
530 Not logged in, only one(也有可能是two or three) session from same IP allowed at a time.
QUIT |
每個(gè)IP只能開一個(gè)(也有可能是two or three) 下載，就不要用多線程啦，小心Ban了你。
以下為引用的內(nèi)容：
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 "=").
120 Service ready in nnn minutes.
125 Data connection already open; transfer starting.
150 File status okay; about to open data connection.
200 Command okay.
202 Command not implemented, superfluous at this site.
211 System status, or system help reply.
212 Directory status.
213 File status.
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.
215 NAME system type. where NAME is an official system name from the list in the Assigned Numbers document.
220 Service ready for new user.
221 Service closing control connection.
225 Data connection open; no transfer in progress.
226 Closing data connection. Requested file action successful (for example, file transfer or file abort).
227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).
230 User logged in, proceed. Logged out if appropriate.
250 Requested file action okay, completed.
257 "PATHNAME" created.
331 User name okay, need password.
332 Need account for login.
350 Requested file action pending further information
421 Service not available, closing control connection.This may be a reply to any command if the service knows it must shut down.
425 Can't open data connection.
426 Connection closed; transfer aborted.
450 Requested file action not taken.
451 Requested action aborted. Local error in processing.
452 Requested action not taken. Insufficient storage space in system.File unavailable (e.g., file busy).
500 Syntax error, command unrecognized. This may include errors such as command line too long.
501 Syntax error in parameters or arguments.
502 Command not implemented.
503 Bad sequence of commands.
504 Command not implemented for that parameter.
530 Not logged in.
532 Need account for storing files.
550 Requested action not taken. File unavailable (e.g., file not found, no access).
551 Requested action aborted. Page type unknown.
552 Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
553 Requested action not taken. File name not allowed
110
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重新啟動(dòng)標(biāo)記應(yīng)答。在這種情況下文本是確定的，它必須是：MARK yyyy=mmmm，其中yyyy是用戶進(jìn)程數(shù)據(jù)流標(biāo)記，mmmm是服務(wù)器標(biāo)記。
120
服務(wù)在nnn分鐘內(nèi)準(zhǔn)備好
125
數(shù)據(jù)連接已打開，準(zhǔn)備傳送
150
文件狀態(tài)良好，打開數(shù)據(jù)連接
200
命令成功
202
命令未實(shí)現(xiàn)
211
系統(tǒng)狀態(tài)或系統(tǒng)幫助響應(yīng)
212
目錄狀態(tài)
213
文件狀態(tài)
214
幫助信息，信息僅對(duì)人類用戶有用
215
名字系統(tǒng)類型
220
對(duì)新用戶服務(wù)準(zhǔn)備好
221
服務(wù)關(guān)閉控制連接，可以退出登錄
225
數(shù)據(jù)連接打開，無傳輸正在進(jìn)行
226
關(guān)閉數(shù)據(jù)連接，請(qǐng)求的文件操作成功
227
進(jìn)入被動(dòng)模式
230
用戶登錄
250
請(qǐng)求的文件操作完成
257
創(chuàng)建"PATHNAME"
331
用戶名正確，需要口令
332
登錄時(shí)需要賬戶信息
350
請(qǐng)求的文件操作需要進(jìn)一步命令
421
不能提供服務(wù)，關(guān)閉控制連接
425
不能打開數(shù)據(jù)連接
426
關(guān)閉連接，中止傳輸
450
請(qǐng)求的文件操作未執(zhí)行
451
中止請(qǐng)求的操作：有本地錯(cuò)誤
452
未執(zhí)行請(qǐng)求的操作：系統(tǒng)存儲(chǔ)空間不足
500
格式錯(cuò)誤，命令不可識(shí)別
501
參數(shù)語法錯(cuò)誤
502
命令未實(shí)現(xiàn)
503
命令順序錯(cuò)誤
504
參數(shù)下的命令功能未實(shí)現(xiàn)
530
未登錄
532
存儲(chǔ)文件需要賬戶信息
550
未執(zhí)行請(qǐng)求的操作
551
請(qǐng)求操作中止：頁類型未知
552
請(qǐng)求的文件操作中止，存儲(chǔ)分配溢出
553
未執(zhí)行請(qǐng)求的操作：文件名不合法
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