java.net.SocketException: Connection reset on HttpsURLConnection

I am trying to call a URL within a java (javafx) application for performing some actions (unzip a zip file), however i am getting (in some cases that i can not identify) an error.

Here is the code:

public void JavaHttpsUrlConnectionReader(String myUrl) throws Exception {
    URL url = null;
    BufferedReader reader = null;
    StringBuilder stringBuilder;
    try {
        url = new URL(myUrl);
        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();

        connection.setRequestMethod("GET");
        // give it 120 seconds to respond
        connection.setReadTimeout(120*1000);
        connection.connect();
        // read the output from the server
        reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        stringBuilder = new StringBuilder();

        String line = null;
        while ((line = reader.readLine()) != null)
        {
          stringBuilder.append(line + "\n");
        }
    }
    catch (Exception e)
    {
      e.printStackTrace();
      throw e;
    }
    finally
    {
        // close the reader; this can throw an exception too, so
        // wrap it in another try/catch block.
        if (reader != null)
        {
          try
          {
            reader.close();
          }
          catch (IOException ioe)
          {
            ioe.printStackTrace();
          }
        }
    }

}

and here is the exception i get:

2015-04-17 12:39:34 INFO TranferFileFtp4j:403 - >> Going to cal url: https://testonline.npapan.com/mcp_unzip.aspx?id=5898
2015-04-17 12:39:35 ERROR FXMLDocumentController:104 - 
java.net.SocketException: Connection reset at java.net.SocketInputStream.read(Unknown Source)
 at java.net.SocketInputStream.read(Unknown Source)
at sun.security.ssl.InputRecord.readFully(Unknown Source)
 at sun.security.ssl.InputRecord.read(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.https.HttpsURLConnectionImpl.connect(Unknown Source)
 at com.npap.network.TranferFileFtp4j.JavaHttpsUrlConnectionReader(TranferFileFtp4j.java:905)
 at com.npap.network.TranferFileFtp4j.renameFileFtps1(TranferFileFtp4j.java:404)
 at com.npap.utils.ProcessDicomFiles.sendZippFiles(ProcessDicomFiles.java:229)
 at com.npap.scheduler.MainJob.execute(MainJob.java:97)
 at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
 at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)    

I guess it is not a timeout issue (since the message does not indicate such a case), however anyone guessing what may cause this timeout issues?