socket.error:[Errno 10061]无法建立连接,因为目标计算机主动拒绝它

Question

我想用python在两台计算机之间传输文件.我在客户端使用ftplib模块,在服务器端使用pyftpdlib.但是,我得到错误"socket.error:[Errno 10061]没有连接,因为目标机器主动拒绝它".我的代码如下:

客户端代码:

import ftplib
ftp = ftplib.FTP("sever_ip")
ftp.login("username", "password")
ftp.retrlines("LIST")

服务器端代码:

from pyftpdlib import servers, handlers
address = ('', 21)  
server = servers.FTPServer(address, handlers.FTPHandler)
server.serve_forever()

我运行服务器端代码并​​得到:

[I 15-05-28 11:14:41] >>> starting FTP server on :::21, pid=8296 <<<
[I 15-05-28 11:14:41] poller: <class 'pyftpdlib.ioloop.Select'>
[I 15-05-28 11:14:41] masquerade (NAT) address: None
[I 15-05-28 11:14:41] passive ports: None

我运行客户端代码并得到:

socket.error: [Errno 10061] No connection could be made because the target machine actively refused it

我需要在目标计算机(服务器)上更改或检查哪些设置才能使其接受连接？(我的服务器是Windows Sever 2012R2,我的客户端是Windows 8)

更新:我打开了服务器的防火墙,然后重新运行了客户端请求.现在我得到了一个不同的错误:

socket.error: [Errno 10060] A connection attempt failed because the connected party did not properly respond after a per
iod of time, or established connection failed because connected host has failed to respond