Shield can be webclient to connect to a server such as Google,... When shield is server, another client can't connect to it as its IP address. What happen to it, how to solve this problem. Can sb help me.
Not enough information provided. Are the Arduino and the client on the same network? Post the sketch you are using.
have a look in this thread, http://arduino.cc/forum/index.php/topic,138023.0.html
you might find what you are looking for :).