thanks all ! I've solved this problem: Let me show my net environment first. My pc is in a local network, and through a proxy server can I reach the Internet, so I changed my Internet Settings.
It seems that everything goes well, I can surf Internet, etc, but what a pity, I can't resolve a host's address by its name by gethostbyname() in C Language; in python, socket.getaddrinfo() will fail. So today, I installed MSFireWallClient which will connect to the ISA server. and after that, everything works: ) Thanks again, Merry Christmas and a Happy New Year!! -- http://mail.python.org/mailman/listinfo/python-list
