Event ID - 8026

Event Id8026
SourceMSExchangeAL
DescriptionLDAP Bind was unsuccessful on directory <directory name> for distinguished name <value>. Directory returned error:[0x<error code>] <error message>. <connection agreement name>
Event InformationAccording to Microsoft:
CAUSE:
The Recipient Update Service is configured to use a Windows domain controller that was demoted. When the Recipient Update Service tries to query the Windows domain controller for an update, it cannot contact it.
RESOLUTION:
If you determine that the issue was caused by the demotion of a Windows domain controller, you can resolve this issue by following these steps:
1. Open Exchange System Manager.
2. Expand the Recipients container, and then click Recipient Update Services.
3. Double-click each Recipient Update Service, and then change the Windows domain controller setting to the new Windows domain controller in the domain.
Reference LinksMSExchangeAL events 8026 and 8260: Cannot access Address List configuration information

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