2825956 - Portal Error 'unable to retrieve the Alias Service' when calling irj/portal

• When calling http://<host>:<port>/irj/portal within your browser, you receive an error:
  Error: Application error occurred during the request processing.
• Within the developer/default trace log files you observe the following error:
  "unable to retrieve the Alias Service

  [EXCEPTION]
  javax.naming.NameNotFoundException: Name not found: com.sap.portal.navigation.AliasService.AliasService [Root exception is com.sapportals.portal.prt.service.ServiceException: Error while retrieving service: com.sap.portal.navigation.AliasService.AliasService]
  at com.sap.portal.prt.broker.jndi.ContextForServices.getObject(ContextForServices.java:37)
  at com.sap.portal.prt.broker.jndi.ContextImpl.lookupChild(ContextImpl.java:22)
  ...
  Caused by: com.sapportals.portal.prt.service.ServiceException: Error while retrieving service: com.sap.portal.navigation.AliasService.AliasServiceat com.sap.portal.prt.service.ServiceManager.get(ServiceManager.java:270)
  ...
  Caused by: com.sap.portal.prt.broker.PortalModuleNotFoundException: Could not retrieve portal application com.sap.portal.navigation.AliasService.AliasService
  at com.sap.portal.prt.broker.PortalAppBroker.ensurePortalModuleIsStarted(PortalAppBroker.java:640)
  ..."

• Checking the System Software Component Information (http://<host>:<port>/nwa/sysinfo), several core Enterprise Portal components are missing including:
• EP-ADMIN
• EP-CONNECTIVITY
• EP-FLP (7.50 only)
• EP-RUNTIME

• SAP NetWeaver Application Server for Java release independent
• Enterprise Portal

Error, Application, error, occurred, during, the, request, processing., SAP Technology Troubleshooting Guide, ep, xi, pi, bpm, ads, sapinst, install, installation, deploy, deployment, access, upgrade, swpm, sum, software, provisioning, manager, upgrade, manager, maintenence, planner, solution, manager, solman , KBA , EP-PIN-NAV , Navigation , EP-PIN-AI , Application Integration , EP-PIN-PRT , Portal Runtime , BC-INS-SWPM , Installation with Software Provisioning Manager , EP-PIN-PCM , Portal Content Model , BC-UPG-MP , Maintenance Planning Tools , BC-UPG-SLM , Software Lifecycle Manager , Problem