3718174 - Why are IDOCs failing in Managed Gateway for Spend&Network with 'unexpected text/html ContentType' error while trying to reach the SAP ERP system?

Symptom

IDOC messages are failing in Managed Gateway for Spend&Network while trying to reach SAP ERP system with the following error:

Fault response received from: ANXXXXXXXXXXX for:ANXXXXXXXXXXX with Status:FAILED and ErrorResponse:Response was of unexpected text/html ContentType. Incoming portion of HTML stream: (none).. Suggested Action : Based on the details of error response, please review following Support KBA for solutions: https://support.ariba.com/item/view/KB0402310 or https://me.sap.com/notes/3181644. If you continue to experience problems, please contact support with the error code CIG-PLT-00676.

Product

SAP Business Network for Procurement and SAP Business Network for Supply Chain all versions ; SAP ERP Central Component all versions ; SAP Integration Suite, managed gateway for spend management and SAP Business Network all versions ; SAP S/4HANA all versions

Keywords

CIG, ISMG, InvoiceDetailRequest, ConfirmationRequest, PayMeNowRequest, SAP Business Network. , KBA , BNS-ARI-CI-AN , Managed Gateway for Business Network , Problem

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