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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