java.net.UnknownHostException for bucketname.s3.amazonaws.com

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public void downloadFile(String baseDir, String imageName) throws IOException {
    this.s3Client = new AmazonS3Client(new BasicAWSCredentials(accessKey,secretKey));
    String s3key = baseDir + "/" + imageName ;
    Log.d(tag, "downloading S3 file with key = " + s3key);
    S3ObjectInputStream content = null;
    try {
        content = s3Client.getObject(bucketName,s3key).getObjectContent();
    } catch(RuntimeException ex) {
        Log.e(tag, "error while downloding S3 file with key = " + s3key ,ex);
        throw new IOException(ex);
    }

02-28 00:48:53.589: D/s3dao(4078): downloading S3 file with key = level1/2_3.jpg
02-28 00:48:54.800: I/AmazonHttpClient(4078): Unable to execute HTTP request: fourpicstest.s3.amazonaws.com
02-28 00:48:54.800: I/AmazonHttpClient(4078): java.net.UnknownHostException: fourpicstest.s3.amazonaws.com
02-28 00:48:54.800: I/AmazonHttpClient(4078): at java.net.InetAddress.lookupHostByName(InetAddress.java:512)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:300)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at java.net.InetAddress.getAllByName(InetAddress.java:259)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:278)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:645)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:480)
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)