Multithread HttpClient 4.1 SSL plan

Essentially, I wish to produce a test client that will send Publish and obtain demands to some server using HTTPS protocol. I'm using apache HttpClient 4.1
Sample of test client is really as below.

class A extends Runnable
{
  HttpClient httpClient;

  A()
  {
    createHttpClient(443);
  }

  private void createHttpClient(int port) {
      try {
          java.lang.System.setProperty(
                  "sun.security.ssl.allowUnsafeRenegotiation", "true");

          // First create a trust manager that won't care.
          X509TrustManager trustManager = new X509TrustManager() {
              public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                  // Don't do anything.
                  return null;
              }

              @Override
              public void checkClientTrusted(
                      java.security.cert.X509Certificate[] chain,
                      String authType)
                      throws java.security.cert.CertificateException {
                  // TODO Auto-generated method stub
              }

              @Override
              public void checkServerTrusted(
                      java.security.cert.X509Certificate[] chain,
                      String authType)
                      throws java.security.cert.CertificateException {
                  // TODO Auto-generated method stub

              }
          };

          // Now put the trust manager into an SSLContext.
          // Supported: SSL, SSLv2, SSLv3, TLS, TLSv1, TLSv1.1
          SSLContext sslContext = SSLContext.getInstance("SSL");
          sslContext.init(null, new TrustManager[] { trustManager },
                  new SecureRandom());

          // Use the above SSLContext to create your socket factory
          // Accept any hostname, so the self-signed certificates don't fail

          SSLSocketFactory sf = new SSLSocketFactory(sslContext,
                  SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

          // Register our new socket factory with the typical SSL port and the
          // correct protocol name.
          Scheme httpsScheme = new Scheme("https", port, sf);

          this.httpclient = new DefaultHttpClient();
          this.httpclient.getConnectionManager().getSchemeRegistry()
                  .register(httpsScheme);


      } catch (Exception ex) {

          System.out.println("=== Error Creating SSL Connection: "
                  + ex.getMessage());

          this.httpclient = null;
      }
  }


  public void run()
  {
    if(this.login()) 
    {
      this.getStartPage();
      this.sendPageRequests();
    }
  }
}

Above code works fine however it spawns up-to simply 60-70 threads though I'm breeding a lot more than 1000 threads. With HTTP it had been breeding a lot more than 1000 threads but after adding support for HTTPS, when i stated earlier only 60-70 synchronised threads were seen i.e. after createHttpClient(int port). I just read about ThreadSafeClientConnManager() and each other things associated with it. But could not get much from it.

Could anybody please guide me why this really is happening? What must i do?