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This article explains how you can perform some basic checks when Group Policy is not working for client computers.
I have found and seen couple of articles on Group Policy Troubleshooting but here are some common things I have come across: The following points should be taken into consideration while Troubleshooting Group Policy. These are the common ones:
Group Policy settings can be applied only when User account or computer account (leaf objects) are in the same container where GPO is applied.
Leaf objects or Groups must have “Read” and “Apply Group Permissions” assigned to them.
Make sure you and users have proper permissions on SYSVOL folder.
Make sure SYSVOL folder is shared properly (type net share \\ip_of_dc) from a client machine or server.
Group Policy Objects may not be processed if Client-Side-Extensions (CSE) are missing in client machine or DLL used to process GPOs are corrupted. You can find the CSE at the following registry location: