Steps to Reproduce

Run a project with zk.xml config:

  <listener>
    <listener-class&amp;amp;gt;org.zkoss.zkmax.au.websocket.WebSocketWebAppInit</listener-class&amp;amp;gt;
  </listener> 

  <session-config>
      <max-desktops-per-session>1</max-desktops-per-session>
       <automatic-timeout/>
 <timeout-uri>/timeout.zul</timeout-uri>
  </session-config>

Open a tab.

Open the same page in a different tab.

Make an action in the first tab (click a button, etc) with an event listener.

Current Result

Tab waits on "processing..." forever.

Expected Result

Tab redirects to timeout URI

Debug Information

If desktop is null, DhtmlUpdateServlet uses wapp.getConfiguration().getTimeoutURI(deviceType) to redirect the page.

WebsocketEndpoint just returns without redirecting

Workaround

attached WebsocketEndpoint.zip