[android-developers] NoHttpResponseExcetion. Target server failed to respond.

Hi, I am trying to implement c2dm and saving the ids into my server.
However when im trying to connect/save values to the server, There's
always an error showing that the target server failed to respond. What
could be the cause?

This is my code:

public void sendRegistrationIdToServer(String deviceId,
String registrationId) {
Log.d("C2DM", "Sending registration ID to my application server");
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://172.28.28.28/test.php?");
try {
List<NameValuePair> nameValuePairs = new
ArrayList<NameValuePair>(1);
// Get the deviceID
nameValuePairs.add(new BasicNameValuePair("deviceid", deviceId));
nameValuePairs.add(new BasicNameValuePair("registrationid",
registrationId));

try {
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
Log.i("LEE", "cannot connect to server");
}
// Execute HTTP Post Request
HttpResponse response = client.execute(post);

BufferedReader rd = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));

String line = "";
while ((line = rd.readLine()) != null) {
Log.e("HttpResponse", line);
}
} catch (IOException e) {
e.printStackTrace();
}
}

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