Hi All I am developing 2 web applications based on "ASP.NET_SessionId" cookies to check session timeout and also to logout : protected void Session_Start(object sender, EventArgs e) { if (Context.Session != null) { //check the IsNewSession value, this will tell us if the session has been reset if (Session.IsNewSession) { string cookie = Request.Headers["Cookie"]; // Code that runs when a new session is started if ((null != cookie) && (cookie.IndexOf("ASP.NET_SessionId") >= 0)) { if (Request.QueryString["timeout"] == null || !Request.QueryString["timeout"].ToString().Equals("yes")) Session.Abandon(); Session.Clear(); Response.Redirect("Login.aspx?timeout=yes"); } } } } This works fine for my first application. When implementing the same logic for the 2nd application when I press logout in one application, the second application is redirected to the login page. How can I fix this? Best regards