python - ConnectionRefusedError: [Errno 111] Connection refused

Question

Python3实现了一个简单的udp server和udp client。host指定为'localhost'时，在同一台机器上是运行正常的。

udpserver.py:

from socket import *

HOST = 'localhost'
PORT = 9999

s = socket(AF_INET,SOCK_DGRAM)
s.bind((HOST,PORT))
print('...waiting for message..')
while True:
        data,address = s.recvfrom(1024)
        print(data,address)
        s.sendto('this is the UDP server'.encode('utf-8'), address)
s.close()

udpclient.py:

from socket import *

HOST='localhost'
#HOST='deque.me'
PORT=9999

s = socket(AF_INET,SOCK_DGRAM)
s.connect((HOST,PORT))
while True:
        message = input('send message: ')
        s.sendall(message.encode('utf-8'))
        data = s.recv(1024)
        print(data)
s.close()

如果将udpclient.py里的host改为"deque.me"，程序会出现错误。

如果udpclient.py和udpserver.py运行在同一台机器上，也就是'deque.me'这台服务器上，错误如下：

ubuntu@VM-117-216-ubuntu:~/Shield/Py3$ python3 udpclient.py
send message: test
Traceback (most recent call last):
File "udpclient.py", line 12, in <module>
data = s.recv(1024)
ConnectionRefusedError: [Errno 111] Connection refused

如果把udpclietn.py放在另一台windows机器上执行，错误提示图下：

D:ShieldPy3>python udpclient.py
send message: test
Traceback (most recent call last):
File "udpclient.py", line 11, in <module>
data = s.recv(1024)
ConnectionResetError: [WinError 10054] 远程主机强迫关闭了一个现有的连接。

试了试将udpserver.py中的host改为'deque.me'和'115.159.29.211'(公网IP地址)，均出现如下错误：

root@VM-117-216-ubuntu:~/Shield/Py3# python3 udpserver.py
Traceback (most recent call last):
File "udpserver.py", line 7, in <module>
s.bind((HOST,PORT))
OSError: [Errno 99] Cannot assign requested address

肯定的是'deque.me'是能正确解析到这Linux服务器的。请问，错在哪里？应该该怎么改？

Answer 1

답은 bing('0.0.0.0', port)으로 찾았습니다.