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Hello All,

im trying to implement single sign on in liferay with cas i have configured the cas using enterprise admin
when i click on sigin in button in liferay a blank page is displayed in browser
in tomcat console an error is thrown

15:19:04,729 ERROR [CASFilter:148] javax.servlet.ServletException: validateUrl must start with https
://, its current value is [http://192.168.1.4:8443/cas/proxyValidate]
javax.servlet.ServletException: validateUrl must start with https://, its current value is [http://1
92.168.1.4:8443/cas/proxyValidate]
        at edu.yale.its.tp.cas.client.filter.CASFilter.init(CASFilter.java:248)
        at com.liferay.portal.servlet.filters.sso.cas.CASFilter.getCASFilter(CASFilter.java:101)
        at com.liferay.portal.servlet.filters.sso.cas.CASFilter.processFilter(CASFilter.java:138)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:91)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:154)
        at com.liferay.portal.sharepoint.SharepointFilter.processFilter(SharepointFilter.java:193)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:91)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:154)
        at com.liferay.portal.servlet.filters.virtualhost.VirtualHostFilter.doFilter(VirtualHostFilt
er.java:148)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:154)
        at com.liferay.portal.servlet.filters.threadlocalcache.ThreadLocalCacheFilter.processFilter(
ThreadLocalCacheFilter.java:55)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:91)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:154)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:94)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

        at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:394)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.ja
va:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:595)
2009-12-01 15:19:10,004 INFO [org.jasig.cas.services.DefaultServicesManagerImpl] - <reloading regist ered services.>
</reloading>

i have followed the steps given in this article

http://www.liferay.com/web/guest/community/wiki/-/wiki/Main/Single+SignOn+-+Integrating+Liferay+With+CAS+Server

but cas is not running on https its running on http