>>> what are you writing back to the client (from where you are opening this
>>> URLConnection) from the servlet?
>>> if it is null, then it could be the problem.

No, I don't open this URLConnection from the servlet.
I open it from the client, and it is not null, when I'm trying to access
it – I think NullPointerException will occur if it is null.

>>> could you please post the servlet code?

I think it is not necessary to post the servlet's code, because the problem
appears in client. Instead, I'll post the client's part where the
ConnectException occurs:

-----
   URL url = new URL(myReq.getURL());
   URLConnection conn = url.openConnection();
   if (myReq.getData() != null) {
      String data = (String) myReq.getData();
      conn.setDoOutput(true);
      PrintWriter out = new PrintWriter(conn.getOutputStream());
      out.println(data);
      out.flush();
      out.close();
   }
   myReq.getCallback().read(new BufferedReader(new 
InputStreamReader(conn.getInputStream())));
-----

ConnectException occurs at the sixth line from the code snipped.

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