title: Azure: How to createa a Access Control Service namespace for a Service Bus namespace?
body: <p>There're 2 kinds of authentication mechanism for Azure Service Bus:</p>
  
  <ul>
  <li>SAS : Shared Access Signature</li>
  <li>ACS : Access Control Service</li>
  </ul>
  
  <p>According to <a href="http://msdn.microsoft.com/en-us/library/dn170478.aspx" rel="nofollow">here</a>,</p>
  
  <blockquote>
    <p>For all (Service Bus) namespaces that were created before August 2014, an
    accompanying ACS namespace was created.</p>
  </blockquote>
  
  <p>Now it is after Aug. 2014, so no accompanying ACS namespace will be created when you create a Service Bus namespace through Azure management portal.</p>
  
  <p>The same link above also instructs to use the following Azure PowerShell cmd-let:</p>
  
  <pre><code>New-AzureSBNamespace YOUR_NAMESPACE –useAcs True
  </code></pre>
  
  <p>But <a href="http://msdn.microsoft.com/en-us/library/dn495165.aspx" rel="nofollow">it turns out the <code>-useAcs</code> parameter doesn't exist</a>.</p>
  
  <p>So how to create ACS namcespace for a SB namespace?</p>