I am getting "javax.net.ssl.SSLHandshakeException: unknown certificate
" error while trying to configure sun j2ee policy agent 2.2 on websphere portal 5.1

The error log says:

07/03/2007 06:32:16:062 PM IST: Thread[Servlet.Engine.Transports : 1,5,main]
AmFilter: now processing: SSO Task Handler
07/03/2007 06:32:16:062 PM IST: Thread[Servlet.Engine.Transports : 1,5,main]
SSOTaskHandler: SSO Validation failed for null
07/03/2007 06:32:16:062 PM IST: Thread[Servlet.Engine.Transports : 1,5,main]
URLFailoverHelper: Checking if https://apollo.maxnewyorklife.com:443/amserver/UI/Login is available
07/03/2007 06:32:16:078 PM IST: Thread[Servlet.Engine.Transports : 1,5,main]
WARNING: URLFailoverHelper: the url https://apollo.maxnewyorklife.com:443/amserver/UI/Login is not available
javax.net.ssl.SSLHandshakeException: unknown certificate
at com.ibm.jsse.bs.a(Unknown Source)
at com.ibm.jsse.bs.startHandshake(Unknown Source)
at com.ibm.net.ssl.www.protocol.https.b.o(Unknown Source)
at com.ibm.net.ssl.www.protocol.https.q.connect(Unknown Source)
at com.ibm.net.ssl.internal.http://www.protocol.https.HttpsURLCo...onnect(Unknown Source)
at com.sun.identity.agents.common.URLFailoverHelper.i sAvailable(URLFailoverHelper.java:190)
at com.sun.identity.agents.common.URLFailoverHelper.g etAvailableURL(URLFailoverHelper.java:129)
at com.sun.identity.agents.filter.AmFilterRequestCont ext.getLoginURL(AmFilterRequestContext.java:757)
at com.sun.identity.agents.filter.AmFilterRequestCont ext.getAuthRedirectURL(AmFilterRequestContext.java :285)
at com.sun.identity.agents.filter.AmFilterRequestCont ext.getAuthRedirectURL(AmFilterRequestContext.java :258)
at com.sun.identity.agents.filter.AmFilterRequestCont ext.getAuthRedirectResult(AmFilterRequestContext.j ava:363)
at com.sun.identity.agents.filter.AmFilterRequestCont ext.getAuthRedirectResult(AmFilterRequestContext.j ava:345)
at com.sun.identity.agents.filter.SSOTaskHandler.doSS OLogin(SSOTaskHandler.java:210)
at com.sun.identity.agents.filter.SSOTaskHandler.proc ess(SSOTaskHandler.java:98)
at com.sun.identity.agents.filter.AmFilter.processTas kHandlers(AmFilter.java:189)
at com.sun.identity.agents.filter.AmFilter.isAccessAl lowed(AmFilter.java:152)
at com.sun.identity.agents.websphere.AmIdentityAssert erBase.processRequest(AmIdentityAsserterBase.java: 195)
at com.sun.identity.agents.websphere.AmTrustAssociati onInterceptor.negotiateValidateandEstablishTrust(A mTrustAssociationInterceptor.java:91)
at com.ibm.ws.security.web.TAIWrapper.negotiateAndVal idateEstablishedTrust(TAIWrapper.java:101)
at com.ibm.ws.security.web.WebAuthenticator.handleTru stAssociation(WebAuthenticator.java:191)
at com.ibm.ws.security.web.WebAuthenticator.authentic ate(WebAuthenticator.java:928)
at com.ibm.ws.security.web.WebCollaborator.authorize( WebCollaborator.java:531)
at com.ibm.ws.security.web.EJSWebCollaborator.preInvo ke(EJSWebCollaborator.java:262)
at com.ibm.ws.webcontainer.webapp.WebAppSecurityColla borator.preInvoke(WebAppSecurityCollaborator.java: 132)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispat cher.dispatch(WebAppRequestDispatcher.java:506)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispat cher.forward(WebAppRequestDispatcher.java:208)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForwar d(WebAppInvoker.java:134)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleIn vocationHook(WebAppInvoker.java:321)
at com.ibm.ws.webcontainer.cache.invocation.CachedInv ocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.srp.ServletRequestProcesso r.dispatchByURI(ServletRequestProcessor.java:246)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDis patcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handle Request(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleReques t(HttpConnection.java:652)
at com.ibm.ws.http.HttpConnection.run(HttpConnection. java:448)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.j ava:936)

From whatever analysis I have done so far, I believe this issue is related to the personal certificate for sun one webserver (on which access manager & LDAP are installed) not registered with the application server (portal server).
I am not sure about the way I go by solving the issue.

Can anybody help me out.

Thanks!