If Federal Information Processing Standards (FIPS) is enabled in an Exchange Server 2016 environment, users cannot log on to Outlook Web Access (OWA). Instead, the user receives the following error page:
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Additionally, the following Event ID 1309 is logged on the Exchange server:
This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms.
This issue occurs because the instance of MD5CryptoServiceProvider is not FIPS compliant.
Cumulative update information
For Exchange Server 2016
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.