Activating ICF Services for the Help Center 
This activity is necessary only if you are using SAP applications in Web Dynpro ABAP in the portal and you want to use the Help Center with them.
Background: After installation of the Application Server ABAP (AS ABAP), all services of the Internet Communication Framework (ICF) are inactive for security reasons. You have to activate the required services manually.
Launch transaction SICF in the SAP system.
Make sure that the hierarchy type Service is set and choose Execute.
In the Virtual Hosts/Services structure, activate the services that are required to run Web Dynpro ABAP (WDA) applications. The corresponding service paths are listed at the link below. To activate a service, choose Activate Service in its context menu.
More Information: Active Services in SICF
In addition to the general WDA services, activate the corresponding service for the Help Center application. You can find this service at the following service path: /default_host/sap/bc/webdynpro/sap/sapguihc_application.