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Symptoms

You have a mixed Exchange Server environment that has servers that are running Microsoft Exchange Server 2013 and Exchange Server 2016. When you run the Get-DatabaseAvailabilityGroupNetwork cmdlet in Exchange Server 2013 for an Exchange Server 2016 database availability group (DAG) object, you receive the following error message:

WARNING: An unexpected error has occurred and a Watson dump is being generated: Object reference not set to an instance of an object.
Object reference not set to an instance of an object.
    + CategoryInfo          : NotSpecified: (:) [Get-DatabaseAvailabilityGroupNetwork], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.Exchange.Management.SystemConfigurationTasks.Get-DatabaseAvailabilityGroupNetwork

Cause

This issue occurs because of a code change in Exchange Server 2016 that requires additional validation.

Resolution

Exchange Server 2013

To resolve this issue, install Cumulative Update 21 for Exchange Server 2013 or a later cumulative update for Exchange Server 2013.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology that Microsoft uses to describe software updates.

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