SAP Knowledge Base Article - Preview

3137626 - Accessing WebGUI shows blank screen through SAP Web Dispatcher


Accessing WebGUI URL through SAP Web Dispatcher shows blank screen.

Browser shows error as "400 Bad Request"

dev_webdisp trace shows below error:

[Thr 140237920491264] * ERROR => URLDecode recognized invalid character in form field of body [ictxxfilt.c 300]

[Thr 140237920491264] * ERROR => illegal request {029e9a19} [http_auth.c 1053]

This is only valid when above symptoms are observed.



  • SAP GUI for HTML
  • SAP Netweaver
  • ABAP Platform


SAP S/4HANA 2020


webgui, SAP GUI for HTML, 400, web dispatcher, blank screen, [ICMSAUTHILLEGALREQUEST], ICMSAUTHILLEGALREQUEST , KBA , BC-CST-WDP , Web Dispatcher , Problem

About this page

This is a preview of a SAP Knowledge Base Article. Click more to access the full version on SAP for Me (Login required).

Search for additional results

Visit SAP Support Portal's SAP Notes and KBA Search.