Symptoms

You can’t use the Test-ExchangeSearch cmdlet for monitoring or testing in Microsoft Exchange Server 2016. Monitoring application by running the Test-ExchangeSearch cmdlet causes the Powershell application pool to crash. In addition, the following error message is logged:

Log Name: Application ​

Source: ASP.NET 4.0.30319.0 ​

Date: DateTime

Event ID: 1325 ​

Task Category: None ​

Level: Error ​

Keywords: Classic ​

User: N/A ​

Computer: ComputerName

Description: An unhandled exception occurred and the process was terminated. ​

Application ID: DefaultDomain ​

Process ID: 7332 ​

Exception: System.NullReferenceException ​Message: Object reference not set to an instance of an object.

Resolution

To fix this issue, install the Cumulative Update 16 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

References

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

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