CDC HTTPConnection error: Bad Socket

Hi,
I try to make an HTTPConnection in CDC/Symbian9.1/P990i. The code runs 
well on emaulator, but on my phone it throws an exception, bad socket.
I have a DevCert with all of cabailities, but the signed app doesn't 
works on device.

The code withaout ttry-catch blocks:

URL url = new URL("http://www.example.com");
HttpURLConnection http = (HttpURLConnection)Connector.open(url);
http.setRequestMethod("POST");
if (http.getResponseCode() == HttpURLConnection.HTTP_OK)
{
   iStrm = http.getInputStream();
   int length = http.getContentLength();

   ...
}

Any help?

thax,