portal Favorites issue in reverse proxy

Hi Experts,

I am facing issue in favorites in portal. I am able to create folder and link in actual portal url, But when i try to login through reverseproxy means, we have diffrent url for end user, once they enter link it will ask uid and password ,once its login it will open our portal, there we are unable to create folders and link in Favorites.But in actual portal url its working fine. Km path and repositorys every thing fine..

Error getting document mode from iView

[EXCEPTION]

javax.naming.NameNotFoundException: Child not found: null at [Root exception is javax.naming.NameNotFoundException: Child not found: null at ]

at com.sapportals.portal.pcd.gl.PcdPersContext.filteredLookup(PcdPersContext.java:714)

at com.sapportals.portal.pcd.gl.PcdPersContext.deepFilteredLookup(PcdPersContext.java:618)

at com.sapportals.portal.pcd.gl.PcdFilterContext.filterLookup(PcdFilterContext.java:488)

at com.sapportals.portal.pcd.gl.PcdProxyContext.recursiveLookup(PcdProxyContext.java:2086)

at com.sapportals.portal.pcd.gl.PcdProxyContext.proxyLookupLink(PcdProxyContext.java:2189)

at com.sapportals.portal.pcd.gl.PcdProxyContext.proxyLookup(PcdProxyContext.java:2125)

at com.sapportals.portal.pcd.gl.PcdProxyContext.lookup(PcdProxyContext.java:1843)

at com.sapportals.portal.pcd.gl.PcdGlContext.lookup(PcdGlContext.java:120)

at com.sapportals.portal.pcd.gl.PcdProxyContext.lookup(PcdProxyContext.java:1824)

at com.sapportals.portal.pcd.gl.PcdProxyContext.lookup(PcdProxyContext.java:1810)

at javax.naming.InitialContext.lookup(InitialContext.java:392)

at com.sapportals.portal.prt.service.laf.util.LafFrameworkPageHandler.getBrowserDocumentMode(LafFrameworkPageHandler.java:296)

at com.sapportals.portal.prt.service.laf.util.LafFrameworkPageHandler.isStandardsMode(LafFrameworkPageHandler.java:74)

at com.sapportals.portal.prt.service.laf.StyleSheetBrowserMapping.getCssFileName(StyleSheetBrowserMapping.java:71)

at com.sapportals.portal.prt.service.laf.AbstractLAFService.getCssFileName(AbstractLAFService.java:136)

at com.sapportals.portal.prt.service.laf.LAFService.getThemePartURL(LAFService.java:697)

at com.sapportals.portal.prt.service.laf.LAFService.getLegacyThemePartURL(LAFService.java:2882)

at com.sapportals.portal.prt.service.laf.LAFServiceDelegate.getLegacyThemePartURL(LAFServiceDelegate.java:378)

at com.sapportals.portal.htmlb.HTMLBService.onHeadTagBegin(HTMLBService.java:139)

at com.sapportals.portal.htmlb.HTMLBService.doDocumentHook(HTMLBService.java:126)

at com.sapportals.portal.prt.service.document.DocumentHookMulticaster.doDocumentHook(DocumentHookMulticaster.java:111)

at com.sapportals.portal.prt.service.document.DocumentHookService.doDocumentHook(DocumentHookService.java:133)

at com.sapportals.portal.prt.service.document.DocumentHookServiceNew.doDocumentHook(DocumentHookServiceNew.java:273)

at com.sapportals.portal.prt.connection.PortalHook.doDocumentHook(PortalHook.java:665)

at com.sap.portal.prt.core.PortalRequestManager.runRequestCycle(PortalRequestManager.java:511)

at com.sapportals.portal.prt.connection.ServletConnection._handleRequest(ServletConnection.java:224)

at com.sapportals.portal.prt.connection.ServletConnection.handleRequest(ServletConnection.java:101)

at com.sap.portal.prt.dispatcher.DispatcherServlet.service(DispatcherServlet.java:132)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.runServlet(FilterChainImpl.java:202)

at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:103)

at com.sap.portal.http.EnrichNavRequestFilter.doFilter(EnrichNavRequestFilter.java:49)

at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:79)

at com.sap.portal.prt.dispatcher.CustomHeaderFilter.doFilter(CustomHeaderFilter.java:58)

at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:79)

at com.sap.portal.http.EnrichNavRequestFilter.doFilter(EnrichNavRequestFilter.java:49)

at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:79)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:441)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:210)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:441)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:430)

at com.sap.engine.services.servlets_jsp.filters.DSRWebContainerFilter.process(DSRWebContainerFilter.java:38)