cas退出问题


纠结了很久，http退出似乎不行，退出后系统还能访问，这个还能接受，只是重定向的路径应该如何处理？
我直接重定向到自定义的登录页面，cas过滤器自动抓下来，跳到cas的登录页面，重新登录就报错了错误是
严重: Servlet.service() for servlet default threw exception
org.jasig.cas.client.validation.TicketValidationException: 
鏈兘澶熻瘑鍒嚭鐩爣 'ST-4661-BIldzNhXmMltridyKDo4-cas'绁ㄦ牴

at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidator.java:86)
at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:217)
at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:120)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)求指点或思路