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Authorization for organizations with modern app-only authentication fails due to expired SSL certificate

KB ID: 4171
Product: Veeam Backup for Microsoft Office 365 | 4.0 | 5.0
Published: 2021-05-25
Last Modified: 2021-05-28
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Challenge

An attempt to authenticate a tenant connection using Veeam Backup for Microsoft Office 365 REST API fails with an invalid/expired certificate error.

Cause

The SSL certificate for the login.microsoftonline.com site has expired in the local certificate store.

Solution

To update an expired certificate, do either of the following:

  • Update all current trusted certificates as described in Microsoft Docs.
  • Navigate to the login.microsoftonline.com site in the web browser, download its certificate and install the certificate on the server.
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