2080 Events caused by empty values in HKLM\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Instance0 in Exchange Server 2019 and 2016

Applies to: Exchange Server 2019Exchange Server 2016


After you set Microsoft Exchange Server 2019 or Exchange Server 2016 to have a static excluded domain controller, the following registry key is created:

HKLM\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Instance0

After you do this, you encounter a 2080 event approximately every 90 seconds. This registry key is used for StaticConfigDomainController to see what you have set in the value of ConfigDCHostName. However, this key is created regardless of whether you intend to set a value. This issue can occur if you also revert the setting in the StaticConfigDomainController to null as you remove the ConfigDCHostName value but retain the key.


To fix this issue, install one of the following updates:

For Exchange Server 2019, install the Cumulative Update 6 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.​

For Exchange Server 2016, install the 
Cumulative Update 17 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.


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