UDP socket works in development server, but not deployed to app engine


TCP socket works fine, but when I use UDP socket, it doesn't work.

After a long eating, my page comes with this:

Error: Server ErrorThe server encountered an error and could not complete 
your request.

If the problem persists, please 
report<http://code.google.com/appengine/community.html> your 
problem and mention this error message and the query that caused it.




Following is my code:

InetAddress aaddr=InetAddress.getByName("220.152.188.241");

InetSocketAddress sockAddress=new InetSocketAddress(aaddr, port);

socket=new DatagramSocket();

String dataToSend="From google";

DatagramPacket packet=new
 DatagramPacket(dataToSend.getBytes(),dataToSend.length(),sockAddress);

socket.send(packet);
if I don't call socket.send, it's OK.

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