import user from AD faild in Build 6008

import user from AD faild in Build 6008

I installed build5500, create the domain configuration and import users from AD success! then upgrade to build6008 by installling the newest service pack + hotfix , attempt to import new users from AD, a error message appears after i check the OU tree: General failure while performing the operation, and always get this message whenever i tried to restart the helpdesk service or the server.

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