SAP Knowledge Base Article - Public

3697670 - Error "Unknown host name (ICM_HTTP_HOST_UNKNOWN)" in S/4HANA when sending documents from S/4HANA to Ariba

Symptom

The following error status is displayed in the Message Monitor (or Message Dashboard): Unknown host name (ICM_HTTP_HOST_UNKNOWN) error is also seen in the application log.

Environment

SAP S/4HANA Cloud Public Edition

Reproducing the Issue

  1. Create a document (for example, RFQ or PO).

  2. Publish the document.

  3. Navigate to the Message Dashboard or Message Monitor.

  4. Select the relevant integration interface.

  5. Observe the failed message with the error ICM_HTTP_HOST_UNKNOWN in the error log.

Cause

The Service URL maintained in the corresponding Communication Arrangement is incorrect or invalid. The system is unable to resolve the target hostname via DNS.

Resolution

1. Communication System

  • Host Name: Must match the valid SAP Ariba CIG endpoint.

2. Communication Arrangement

  • Outbound Services settings must be:  

    • Service Status: Active

    • Port: 443

    • Path: /cxf/receiveS4SOAP

Keywords

RFQ, Ariba, ICM_HTTP_HOST_UNKNOWN, Message Monitor, DNS, Service URL, Communication Arrangement, Communication System, CIG, receiveS4SOAP,42K,4BL,2NV , KBA , MM-PUR-HUB-RFQ-2CL , Central RFQ/Central Quotations (Public Cloud) , Problem

Product

SAP S/4HANA Cloud Public Edition all versions