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我正在使用 pyftpdlib 制作自定义 FTP 服务器。我需要支持 TLS 和带宽限制，这两者都在教程文档中介绍。但是，当我尝试将它们一起使用时，当我尝试连接 FileZilla 时出现错误：

Status: Resolving address of localhost
Status: Connecting to [::1]:2121...
Status: Connection established, waiting for welcome message...
Status: Initializing TLS...
Status: Verifying certificate...
Status: TLS connection established.
Status: Logged in
Status: Retrieving directory listing...
Command:    PWD
Response:   257 "/" is the current directory.
Command:    TYPE I
Response:   200 Type set to: Binary.
Command:    EPSV
Response:   229 Entering extended passive mode (|||9527|).
Command:    MLSD
Response:   150 File status okay. About to open data connection.
**Error:    GnuTLS error -15: An unexpected TLS packet was received.**
Error:  Transfer connection interrupted: ECONNABORTED - Connection aborted
Response:   226 Transfer complete.
Error:  Failed to retrieve directory listing

我的代码（主要是从教程中粘贴的）：

import os

from pyftpdlib.handlers import TLS_FTPHandler, ThrottledDTPHandler
from pyftpdlib.servers import FTPServer
from pyftpdlib.authorizers import DummyAuthorizer


def main():
    authorizer = DummyAuthorizer()
    authorizer.add_user('user', '12345', os.getcwd(), perm='elradfmw')
    authorizer.add_anonymous(os.getcwd())

    dtp_handler = ThrottledDTPHandler
    dtp_handler.read_limit = 30720  # 30 Kb/sec (30 * 1024)
    dtp_handler.write_limit = 30720  # 30 Kb/sec (30 * 1024)

    ftp_handler = TLS_FTPHandler
    ftp_handler.authorizer = authorizer
    ftp_handler.certfile = "C:\\temp\\certificates\\test.pem"
    # have the ftp handler use the alternative dtp handler class
    ftp_handler.dtp_handler = dtp_handler

    server = FTPServer(('', 2121), ftp_handler)
    server.serve_forever()

    if __name__ == '__main__':
        main()

如果我取出这条线：

ftp_handler.dtp_handler = dtp_handler

我可以连接，但这当然可以消除限制。

有没有办法让 DTP 处理程序类与 TLS 一起工作？

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