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    <p>You are right, <code>*_anon_*</code> ciphers are used for a complete unauthenticated connection (both server and client are anonymous). With these cipher suites no certificate is required. I wrote a small code to test:</p> <pre><code>ServerSocketFactory sf = SSLServerSocketFactory.getDefault(); final SSLServerSocket socket = (SSLServerSocket)sf.createServerSocket(443); System.out.println(Arrays.toString(socket.getSupportedCipherSuites())); System.out.println(Arrays.toString(socket.getEnabledCipherSuites())); socket.setEnabledCipherSuites(new String[] {"SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA"}); Thread t = new Thread() { public void run() { try { Socket client = socket.accept(); client.getOutputStream().write("Hello World\n".getBytes("ASCII")); client.close(); } catch (IOException ioe) { } } }; t.start(); Thread.sleep(2000); SSLSocket client = (SSLSocket) SSLSocketFactory.getDefault().createSocket("localhost", 443); client.setEnabledCipherSuites(new String[] {"SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA"}); InputStream in = client.getInputStream(); byte[] data = new byte[1024]; int len = in.read(data); System.out.println(new String(data, 0, len)); </code></pre> <p>I know that this code is not perfect but I successfully exchange data between the client and the server. Maybe your server or client socket is not well configured. Can you give the full stacktrace you got?</p> <p>Note that these ciphers are deprecated since there are vulnerable to man-in-the-middle attacks. </p> <p><strong>UPDATE</strong> : I found the issue. The <code>anonCipherSuitesSupported</code> array length is too long. Therefore after adding the <code>*_anon_*</code> the array is ending with a bunch of <code>null</code> values. And the implementation does not seem to accept <code>null</code> in the enabled cipher list.</p> <pre><code>String[] supported = server.getSupportedCipherSuites(); List&lt;String&gt; list= new ArrayList&lt;String&gt;(); for(int i = 0; i &lt; supported.length; i++) { if(supported[i].indexOf("_anon_") &gt; 0) { list.add(supported[i]); } } String[] anonCipherSuitesSupported = list.toArray(new String[0]); </code></pre>
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    1. COI have updated my post
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    2. COAnd I update the response.
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    3. COYou are correct!If I set as enabled only the anon cipher suites both in client and server,changing the code as you say, it works.But for the part where I place as enabled the anon cipher suites along with the current enabled, there is no issue with the array size.But it does not work.Does this mean that the non anon ciphers take precendence?
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