You want to check the ESS (Frontend) Application outside the Portal to make sure it is working on stand-alone mode when called/started directly.
This KBA explains the detailed steps about how to start ESS Leave request application directly in stand-alone mode.
|Human Capital Management (HCM) Time Management XSS|
|SAP enhancement package 5 for SAP ERP 6.0|
|SAP enhancement package 6 for SAP ERP 6.0|
|SAP enhancement package 7 for SAP ERP 6.0|
|SAP enhancement package 8 for SAP ERP 6.0|
SE80, Stand-Alone Mode, Outside Portal, ess~lea/LeaveRequest, BSP Application, Web Dynpro, FPM Application Configurations, PAOC_TIM_ESS_WDA, HRESS_AC_PTARQ_LEAVREQ_1, BSP Library, BSP Applications, PAOC_TIM_ESS_UI5 and HRESS_LEAVREQ_G. , KBA , PT-RC-UI-XS , Leave Self Services Web Dynpro , How To
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