问题描述
我正在通过隐式SSL使用FTP上传一些文件.我遇到以下错误消息
I am using FTP over implicit SSL to upload some files.I encountered the following error message
[Command] PWD
[Response] 257 "/" is current directory.
[Command] PWD
[Response] 257 "/" is current directory.
[Command] TYPE A
[Response] 200 Type set to A
[Command] PWD
[Response] 257 "/" is current directory.
[Command] PASV
[Response] 227 Entering Passive Mode (10,0,0,19,195,113)
[Command] LIST -aL
[Response] 521 PROT P required
[Command] PWD
[Response] 257 "/" is current directory.
[Command] PASV
[Response] 227 Entering Passive Mode (10,0,0,19,195,114)
[Command] LIST -aL
[Response] 521 PROT P required
[Status] Failed::FTP protocol error. 521 PROT P required.
我可以知道此错误消息需要521 PROT P"是什么意思吗?
May I know what is this error message "521 PROT P required" saying?
谢谢
推荐答案
在开始数据传输(例如，在控制连接之外创建新的数据连接以传输文件或列表)之前，您必须使用 PROT 命令.主要保护级别是 P 用于受保护(例如SSL加密)或 C 用于清除(不加密).服务器抱怨，因为您没有指定保护级别，因此它不知道如何获取数据.
Before starting a data transfer (e.g. creating a new data connection outside the control connection to transfer files or listing) you have to specify the protection level using the PROT command. The main protection levels are P for protected (e.g. SSL encryption) or C for clear (no encryption). The server complains, because you don't specify a protection level and so it does not know how you want to get your data.
PROT 命令必须由所有ftps客户端实现并使用.
The PROT command must be implemented and used by all ftps clients.
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