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3066531 - Instantaneous "400 session timeout" when accessing WebGUI transactions through a Web Dispatcher


When accessing the WebGUI through an SAP Web Dispatcher, an error page stating "400 session timeout" is displayed immediately.

Subsequent access attempts show the error:

        service tree "/default_host/sap/public/bc/its" is not available for HTTP access

Accessing the WebGUI bypassing the Web Dispatcher works.

The parameter "is/instname_encoding" is set at the profiles of the ABAP system behind the Web Dispatcher.



  • SAP NetWeaver release independent
  • SAP Web Dispatcher release independent


SAP NetWeaver all versions


Web gui , KBA , BC-CST-WDP , Web Dispatcher , BC-FES-WGU , SAP GUI for HTML , BC-FES-ITS , SAP Internet Transaction Server , BC-CST , Client/Server Technology , Problem

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