socket.error: [Errno 10054] An existing connection was forcibly closed by the remote host

最近在网络编程开发中遇到socket.error: [Errno 10054] An existing connection was forcibly closed by the remote host这样的错误，查了些资料也没什么用；

最后发现原来是socket server在设计时提前将socket套接字对象关掉了，所以导致下次使用找不到socket server的套接字对象而报错

import socket
from threading import  Thread
import time
command=["hostname","ipconfig","systeminfo"]
command="###".join(command)
print(command)
s=socket.socket()
socket.setdefaulttimeout(5)
s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
addr=("0.0.0.0",9999)
s.bind(addr)
s.listen(5)
print("waiting for connecting.....")
def fun(s,c,a):
    for i in command.split("###"):
        time.sleep(1)
        n=c.send(str(i).encode())
        print "send command {} to client".format(i),n,"bytes"
    c.close()
    #s.close()
while True:
    c,a=s.accept()
    if c:
        print("I have enter into windwos ")
        print a,c
    t=Thread(target=fun,args=(s,c,a))
    t.setDaemon(True)
    t.start()

注释掉s.close()就可以正常运行，多次调用了
经实验，如果在socket server套接字对象关闭之前调用，程序是可以正常运行的，关闭之后再调用，就会报错了！！！