I try to connect real robot using socket but it shows 'socket connection refused' [closed]

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In linux, I run a socket client python file and it returns socket connection refused.I ping the address of the robot system and it works.Then, I use a socket_tool.exe software which successfully send command to the robot. I am confused about the reason why I cannot use python socket to send command to the to robot.

The following is the socket cilent code writing by python.

import socket

target_ip = ("192.168.1.12" , 2000)

sk = socket.socket()

sk.connect(target_ip)

send_cmd = 'shutdown'

sk.send(send_data1.encode('utf8'))