You should synchronize all AD Modules whenever you change or delete a user in AD, change user permissions in AD, or make changes to a domain controller.
When you synchronize all AD modules, CC-SG retrieves the user groups for all configured AD modules, compares their names with the user groups that have been imported into CC-SG or associated with the AD module within CC-SG, and refreshes the CC-SG local cache. The CC-SG local cache contains all domain controllers for each domain, all user groups that are associated with modules in CC-SG, and the user information for the known AD users. If user groups have been deleted from the AD modules, CC-SG removes all associations to the deleted group from its local cache as well. This ensures that CC-SG has the most current AD user group information.
If changing the password for a user in MSFT Windows Server 2003 AD, both the old and the new passwords are valid for around 30 minutes. During this period, the user can log into CC-SG with either password. This occurs because AD caches the old password for 30 minutes before the new password is fully updated.