C2DM not being send- No subject alternative DNS name matching android.clients.google.com found - google-app-engine

Question

Hi I have the following code which is supposed to c2dm to an android device. When I run it on my local machine, I get an error
stating: Exception in thread "main"
javax.net.ssl.SSLHandshakeException:
java.security.cert.CertificateException: No subject alternative DNS
name matching android.clients.google.com found.
Does anyone
public class MessageUtil
{
private final static String AUTH = "authentication";
private static final String UPDATE_CLIENT_AUTH = "Update-Client-Auth";
public static final String PARAM_REGISTRATION_ID = "registration_id";
public static final String PARAM_DELAY_WHILE_IDLE = "delay_while_idle";
public static final String PARAM_COLLAPSE_KEY = "collapse_key";
private static final String UTF8 = "UTF-8";
public static void main(String args[]) throws IOException
{
String auth_token=AuthenticationUtil.token;
String registrationId="c2dmregistration id of the device";
String message_title="Test";
int response=sendMessage(auth_token, registrationId,message_title);
System.out.println(response);
}
public static int sendMessage(String auth_token, String registrationId,String message_title) throws IOException
{
URL url = new URL("https://android.clients.google.com/c2dm/send");
StringBuilder postDataBuilder = new StringBuilder();
postDataBuilder.append(PARAM_REGISTRATION_ID).append("=").append(registrationId);
postDataBuilder.append("&").append(PARAM_COLLAPSE_KEY).append("=").append("0");
postDataBuilder.append("&").append("data.payload").append("=").append(URLEncoder.encode(message_title, UTF8));
byte[] postData = postDataBuilder.toString().getBytes(UTF8);
HttpURLConnection conn= (HttpURLConnection)url.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded;charset=UTF-8");
conn.setRequestProperty("Content-Length",Integer.toString(postData.length));
conn.setRequestProperty("Authorization", "GoogleLogin auth="+ auth_token);
OutputStream out = conn.getOutputStream();
out.write(postData);
out.close();
int responseCode = conn.getResponseCode();
return responseCode;
}
}
When I run this code, I'm getting the following error:
Exception in thread "main" javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No subject alternative DNS name matching android.clients.google.com found.
at sun.security.ssl.Alerts.getSSLException(Unknown Source)
at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
at sun.security.ssl.Handshaker.processLoop(Unknown Source)
at sun.security.ssl.Handshaker.process_record(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(Unknown Source)
at com.metalclub.mobile.inbox.MessageUtil.sendMessage(MessageUtil.java:45)
at com.metalclub.mobile.inbox.MessageUtil.main(MessageUtil.java:24)
Caused by: java.security.cert.CertificateException: No subject alternative DNS name matching android.clients.google.com found.
at sun.security.util.HostnameChecker.matchDNS(Unknown Source)
at sun.security.util.HostnameChecker.match(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.checkIdentity(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
... 14 more

Answer 1

You're sending the message to the wrong API endpoint. The correct URL is https://android.apis.google.com/c2dm/send