1. Ensure the credentials used to authenticate with each system are correct and working.

2. Check all active directory-connected devices for cached credentials.

3. Monitor the security logs for suspicious activity.

4. Add the appropriate delayed response time to the Active Directory security policy.

5. Verify that all applications and services that access Active Directory are properly configured with up-to-date accounts.

6. Make sure that users are not connecting to Active Directory with duplicate accounts.