Hi Henri, indeed am i (trying to) use ajp13 with jk_mod but the error is reproducible with jserv to. Here are the code snipples -> public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { HttpSession currentSession = req.getSession(true); if (!(sessions_.contains(currentSession))) { System.out.println("in DoGET: found new session"); sessions_.add(currentSession); currentSession.setAttribute("phase", "A"); System.out.println("session: "+ currentSession); } if(req.getParameter("user")!= null) currentSession.setAttribute("user", req.getParameter("user")); if (everything OK) { out.println("<form method=\"POST\" action=" + redirectToMyself_ + " target=\"_self\">"); out.println("<input type=\"hidden\" name=\"UserTyp\" value=\"Gast\"><input type=\"hidden\" name=\"T1\"value=\"GastReg\">"); out.println("<input type=\"hidden\" name=\"T1\" value=\"gastReg\">"); out.println("submit ...."); } } public void doPost (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { System.out.println("in DoPost"); System.out.println("req.getSession ->" + req.getSession(false)); } so that gives two different session objects (), and req.getSession(false) shouldnt return a new session! Thanks for your help :) Cheers Hartwig