Error Code Portal
MicrosoftMicrosoft Entra IDError code

AADSTS50017

CertificateValidationFailed

Alternative forms: 50017

What does this code mean?

Code AADSTS50017 · An issue reported by Microsoft Entra ID.

Official explanation · Original text

CertificateValidationFailed - Certification validation failed, reasons for the following reasons: Cannot find issuing certificate in trusted certificates list Unable to find expected CrlSegment Cannot find issuing certificate in trusted certificates list Delta CRL distribution point is configured without a corresponding CRL distribution point Unable to retrieve valid CRL segments because of a timeout issue Unable to download CRL Contact the tenant admin.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Microsoft Entra authentication and authorization error codes ↗

Creator: Microsoft Corporation and contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted official AADSTS table; Markdown stripped; short English error name selected; original Korean product context added. Official general diagnostic guide is distinguished from code-specific troubleshooting. Documentation license explicitly granted by README Legal Notices; repository LICENSE currently contains MIT terms, also retained as evidence.

Source details · Original licenses and notices