<div dir="ltr">Hello everyone , <div><br></div><div>I use IDP3 and shibCas as external authentification method , </div><div><br></div><div>I have set the <b>idp.session.timeout</b> into 15 minutes </div><div><b>idp.auth.defaultLifefime</b> and<b> idp.auth.defaultLifefime</b> are  not changed .</div><div><br></div><div>when i try to authenticate then i stay on the CAS login page for 30 minutes then i get this error after typing the login and the password .</div><div>the weird is that when i stay between 15 min and 30 min , there is no problem , i can authenticate without problem.</div><div><br></div><div>can anyone help me </div><div><br></div><div><div><pre style="color:rgb(0,0,0)">javax.servlet.ServletException: Error processing ShibCas authentication request
        net.unicon.idp.externalauth.ShibcasAuthServlet.doGet(ShibcasAuthServlet.java:152)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        net.shibboleth.idp.log.SLF4JMDCServletFilter.doFilter(SLF4JMDCServletFilter.java:64)
        net.shibboleth.utilities.java.support.net.RequestResponseContextFilter.doFilter(RequestResponseContextFilter.java:60)
        org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
</pre><p style="font-family:Tahoma,Arial,sans-serif;color:rgb(0,0,0);font-size:12px;background-image:initial;background-repeat:initial"><b style="color:white;background-color:rgb(82,93,118)">caused by</b></p><pre style="color:rgb(0,0,0)">net.shibboleth.idp.authn.ExternalAuthenticationException: No conversation state found in session
        net.shibboleth.idp.authn.ExternalAuthentication.startExternalAuthentication(ExternalAuthentication.java:89)
        net.unicon.idp.externalauth.ShibcasAuthServlet.doGet(ShibcasAuthServlet.java:113)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        net.shibboleth.idp.log.SLF4JMDCServletFilter.doFilter(SLF4JMDCServletFilter.java:64)
        net.shibboleth.utilities.java.support.net.RequestResponseContextFilter.doFilter(RequestResponseContextFilter.java:60)
        org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)</pre></div><br>
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