Backup Fails With the Error “PKCS12 (PFX)”
Challenge
Backup of SharePoint Online objects fails with the error:
PKCS12 (PFX) without a supplied password has exceeded maximum allowed iterations. See https://go.microsoft.com/fwlink/?linkid=2233907 for more information
Cause
This error is reported by Veeam Backup for Microsoft 365 from the underlying .NET Framework, and is a known issue of KB5027124 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1809 and Windows Server 2019.
Solution
Follow the instructions provided by Microsoft on the page in the error message (https://go.microsoft.com/fwlink/?linkid=2233907) to apply one of the solutions.
No actions within Veeam Backup for Microsoft 365 are required.
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