Group Policy is a broad area of administration that requires careful management. Like any area of administration, Group Policy must also be carefully maintained to ensure proper operation, and you must diagnose and resolve any problems that occur. To troubleshoot Group Policy, you need a strong understanding of how policy is refreshed and processed. You also need a strong understanding of general maintenance and troubleshooting tasks.
When you make changes to a group policy, those changes are immediate. However, they aren’t propagated automatically. Client computers request policy at the following times:
When the computer starts
When a user logs on
When an application or user requests ...