Frequent AD account lockouts can be a frustrating issue for both end-users and IT administrators. Here are some steps you can take to resolve the issue:
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Check the Event Logs: Start by checking the event logs on the domain controller(s) to see if there are any indications of what might be causing the account lockouts. The logs may provide information on the source of the lockouts, such as the computer or service where the account is being used.
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Check Password Expiration: Ensure that the users password is not set to expire soon. If it is, have the user change their password before the expiration date.
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Verify Logon Credentials: Verify that the user is using the correct logon credentials. Its possible that the user is mistyping their password or username, which is causing the account to be locked out.
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Disable Cached Credentials: If the user has logged on to a computer using cached credentials, they may be entering the wrong password and causing the account to lock out. To prevent this, disable cached credentials on the users computer.
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Check Services and Scheduled Tasks: Check if there are any services or scheduled tasks running on the users computer that are using the users credentials. If there are, update the services or tasks to use a service account or an account with less privileges.
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Disable Unused Devices: If the user has logged on to multiple devices, check if any of them are unused or have been decommissioned. If so, disable or remove them from the network to prevent them from using the users credentials.
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Change Password on all Devices: In some cases, the users account may be locked out due to a password change that has not been updated on all devices. Have the user change their password and update it on all devices they use to log in.
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Use Account Lockout Policy: Consider using the account lockout policy in Active Directory to help prevent brute force attacks on the users account.
By following these steps, you should be able to identify and resolve the issue causing frequent AD account lockouts.