Event ID - 8209

Event Id8209
SourceMicrosoft-Windows-IDMU-Psync
DescriptionFailure in searching Active Directory.
Event InformationAccording to Microsoft :
Cause
This event is logged when Failure in searching Active Directory.
Resolution
Correct LDAP failure
Password propagation failed because of a Lightweight Directory Access Protocol (LDAP) error. Password Synchronization failed to bind to the default Active Directory® Domain Services server on localhost. Possible causes of this error can be either of the following:
The server on which Password Synchronization is running is no longer an Active Directory Domain Services domain controller.
The LDAP service is not running.
Perform the following steps to solve this problem.
1.Open the Services MMC snap-in (Services.msc) by clicking Start, pointing to Administrative Tools, and then clicking Services.
2.Verify that the Active Directory Domain Services domain controller service is running.
If the domain controller service does not exist, the computer is probably not a domain controller. Server for NIS can only run on an Active Directory Domain Services domain controller. To promote the computer to a domain controller, see the Active Directory Domain Services Help. Run the dcpromo utility and view the Help available with the dcpromo wizard.
3.If the service is not running, double-click the service in the results pane.
4.On the General tab of the Properties dialog box, set Startup type to Automatic.
5.Click OK.
Verify
Retry Windows to UNIX password synchronization for any failed user password change attempts to verify that Password Synchronization is operating normally. Password Synchronization is operating normally when password synchronization succeeds and is operating under warning conditions if synchronization fails for some passwords but succeeds for others.
If password synchronization succeeds for some passwords but fails for others, Windows to UNIX Password Synchronization Configuration is likely fully operational, but there might be account- or computer-specific configuration problems preventing password changes from being synchronized on UNIX-based hosts.
Reference LinksEvent ID 8209 from Microsoft-Windows-IDMU-Psync

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