Hi Brendan_007,
Thank you for posting in the Microsoft Community Forums.
- Verify Group Policy settings
First, make sure that Default Domain Policy is correctly applied to all servers. You can use the following command to view the Group Policy Result Set (RSOP):
bash
gpresult /h C:\gpresult.html
This will generate an HTML file under the specified path, which you can open in your browser to view the detailed Group Policy settings and applications.
- Check the specific settings of the password policy
Since the problem points to the password policy, you should check the following points:
Ensure that the password policy settings are consistent across all servers and meet your security requirements.
Check if any other Group Policy Objects (GPOs) override the default password policy settings.
Check to see if any custom GPOs have been incorrectly linked to OUs (organizational units) or sites, which could lead to policy conflicts.
- Check Group Policy Inheritance and Linking
Use the Group Policy Management Tool (GPMC) to check the linking and inheritance settings for group policies.
Ensure that no unnecessary GPOs are linked to OUs that contain these servers, especially those that may contain conflicting settings.
- Review event logs
Carefully review the system logs and security logs for any other errors or warnings related to password policies or group policies.
Pay particular attention to any errors related to LDAP (Lightweight Directory Access Protocol), as password policies are often stored in Active Directory.
- Registry and Winlogon Logs
If winlogon.log does not provide enough information, you may consider increasing the level of detail in the log or looking at other relevant registry entries. Note, however, that direct modification of the registry can be risky, so make sure you know what you're doing or back up the registry before making changes.
Another possible tool is Process Monitor (from the Sysinternals suite), which captures all registry accesses and system calls related to winlogon.
6 Upgrading or patching the server
If possible, consider updating Windows Server 2016 and 2019 systems to the latest patch level. This can address known security and compatibility issues.
Best regards
Neuvi