SAP Knowledge Base Article - Preview

3770084 - 401 Authentication Error in Load Balancer.

Symptom

  • mTLS handshake fails at client certificate verification stage . 
  • HAProxy log error: “SSL client CA chain cannot be verified”
  • Client side error: “Certificate validation failed - unknown_ca”
  • Client logs indicate multiple CAs supported by Load Balancer.
  • Load balancer responds with HTTP 401 Unauthorized


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Environment

SAP Traceability Hub

Product

SAP Traceability Hub all versions

Keywords

mTLS, HTTP 401, HAProxy, Root CA missing, SSL handshake failure, unknown_ca, certificate validation, Custom Domain Manager, client authentication , KBA , IS-LS-TH-OBT , SAP Traceability Hub Onboarding Issues , Problem

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