最近在学习计算机网络自顶向下这本书 看到书本 P107 开始讲的套接字编程 我照着书本打了一遍代码，测试下来在本机（也就是 ip 127.0.0.1 ）可以运行 但是我把 UDPServer.py 放到我的阿里云服务器（并将 hostname 改为服务器公网 ip ）上运行，UDPClient 就没反应了?请问是什么原因呢?
客户端
from socket import *
serverName = "106.14.209.139"
serverPort = 10002
clientSocket = socket(AF_INET,SOCK_DGRAM)
message = raw_input("Input lowercase sentence:")
clientSocket.sendto(message,(serverName, serverPort))
modifiedMessage, serverAddress = clientSocket.recvfrom(2048)
print serverAddress
print modifiedMessage
clientSocket.close()
阿里云 ubuntu 服务器上
from socket import *
serverPort = 88
serverSocket = socket(AF_INET,SOCK_DGRAM)
serverSocket.bind(("", serverPort))
print "The server is ready to receive"
while True:
message, clientAddress = serverSocket.recvfrom(2048)
print clientAddress,message
modifiedMessage = message.upper()
serverSocket.sendto(modifiedMessage, clientAddress)
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