SAP Knowledge Base Article - Preview

3122644 - ICM - No more ABAP sessions available for protocol: HTTP/HTTPS (<nr>%)


 You get the error message "503 service not available" when trying to access the ABAP system via HTTP/HTTPS

 In the dev_icm trace file, the following message appears:

[Thr <nr>] *** ERROR => IcmSendRq: No more ABAP sessions available for protocol: HTTP/HTTPS (<nr>%) [icxxif.c 1
[Thr <nr>] *** ERROR => IcmCreateDpRequest: Server overload {00f47936} [icxxthr.c 4765]
[Thr <nr>] DTRACE(244/424246/1): {root-id=70B5E8DE6FA11EEC92EE555F0FED1A13}_{conn-id=70B5E8DE6F
[Thr <nr>] role: Server, protocol: HTTP/HTTPS, local: <IP address>:<HTTP/HTTPS port nr>, peer: <IP address>:<port nr>
[Thr <nr>] *** ERROR => IcmPlFlushBuf: IcmConnRollInWP failed: No more connections available(-12) [icxxplugi



  • SAP Netweaver
  • SAP Web Application Server for SAP S/4 HANA
  • ABAP Platform - Application Server ABAP


ABAP platform all versions ; SAP NetWeaver all versions


503 service not available, ABAP sessions, server overload , KBA , BC-CST-IC , Internet Communication Manager , 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.