TLS with ThrottledDTPHandler error

[ajinwu]

hello, I have an error when TLS open and download limit, I recvied an error:

like this:

ls: Fatal error: gnutls_handshake: An unexpected TLS packet was received.

my puftpdlib version: pyftpdlib 1.5.6

my python version: Python 3.6.3

mycode:

import os

from pyftpdlib.handlers import FTPHandler, ThrottledDTPHandler, TLS_FTPHandler
from pyftpdlib.servers import FTPServer, ThreadedFTPServer
import logging
from hashlib import md5
from Auth.myauth import Auth

def main():
    authorizer = Auth()

    authorizer.add_user('user', md5("12345".encode("utf-8")).hexdigest(), './', perm='elradfmwMT')
    authorizer.add_anonymous(os.getcwd())

    # limit download and upload
    dtp_handler = ThrottledDTPHandler
    dtp_handler.read_limit = 1000 * 100
    dtp_handler.write_limit = 1000 * 10

    # handler logic
    # handler = FTPHandler
    # handler.authorizer = authorizer
    # handler.dtp_handler = dtp_handler
    # handler.banner = "ftp server is running"
    address = ('0.0.0.0', 21)

    # ssl support
    handler = TLS_FTPHandler
    handler.certfile = 'M:\\ftp_server\cert_file\cert.pem'
    handler.keyfile = 'M:\\ftp_server\cert_file\key.pem'
    handler.authorizer = authorizer
    handler.tls_control_required = True
    handler.tls_data_required = True
    # handler.dtp_handler = dtp_handler
    handler.banner = "ftp server is running"
    # logging
    logging.basicConfig(format='%(asctime)s  %(filename)s : %(levelname)s  %(message)s', datefmt='%Y-%m-%d %A %H:%M:%S',
                        filename='../log/ftp.log', level=logging.DEBUG)
    server = FTPServer(address, handler)
    server.max_cons = 256
    server.max_cons_per_ip = 5

    # start ftp server
    server.serve_forever()

if __name__ == '__main__':
    main()