SAP Knowledge Base Article - Preview

3707838 - "426 Upgrade Required" during RFC Connection Test

Symptom

  • Error message: "426 Upgrade Required" encountered during HTTP RFC connection test.
  • The issue occurs specifically when HTTP/1.0 is used instead of HTTP/1.1 for the connection test in transaction SM59.

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental." 


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Environment

  • ABAP Web Services
  • SAP NetWeaver
  • SAP NetWeaver Application Server for SAP S/4HANA
  • ABAP PLATFORM - Application Server ABAP

Product

ABAP platform all versions ; SAP ERP all versions ; SAP NetWeaver all versions ; SAP S/4HANA all versions ; SAP Web Application Server for SAP S/4HANA all versions

Keywords

426 upgrade is required, HTTP RFC connection test, HTTP/1.0, HTTP/1.1, SAP Note 2547968, SM59, RFC destination, ICM restart, HTTP protocol version, SAP ERP , KBA , BC-MID-ICF , Internet Communication Framework , BC-CST-IC , Internet Communication Manager , BC-MID-ICF-LGN , ICF System Login , Problem

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