I've recenlty needed to lock down the permissions on a certain folder on my network. A user joined my company and needs access to this folder. I created an account in AD and added that account into the needed folders permissions tab with full control. I apply the changes and close the dialog box. I open the dialog box again (within 5 seconds of closing) and the account is now an "Account Unknown (SID #)"
We have two DC's (Windows 2K3 amd 2K8) with no outside trusts. I've verified the time sync between the two have been able to log onto our network with the new user's account. The only problem lies in applying permissions to folder's. Any help would be greatly appreciated.