服务器拒绝接入,errno 61 connection refuse

如题,按照上面来的,报错:

Traceback (most recent call last):   File "client.py", line 5, in <module>     client.connect(('172.18.11.169', 8999)) # 2. 连接服务端（注意，IP和端口要和服务端一致）   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 228,