In order to limit the target accounts that have access to use cached credentials we will use a Domain Local group in the Source Environment to add in the target account members to control which target users accounts will have the ability to authenticate to source workstations.
In Active Directory Users and Computers Create a Domain Local Group.
Open the group and add in the target user accounts for all migrating source users. In the below example I am adding the target account for Alissa Loftis who is a migrating user from the Source Forest.
Once everyone’s Target user accounts have been added to the source local group, we will then want to assign the right to authenticate for that domain local group on any OU containing workstations being migrated.
Once you find the OUs you need to assign the permissions to you want to right click the OU and choose Properties.
Click on the Security tab and choose Advanced.
On the Advanced Security Setting screen click on Add.
Click Select a Principal and find the domain local group you created previously, ensure the type is set to Allow and the Applies to is set to Descendant Computer Objects. Once the permissions have loaded you want to find and check off the permission Allowed to authenticate. You may have to screen down the list of available permissions to find it. Click Ok, once completed.
Back on the Advanced Security Settings screen, click Apply and close both menus.
Repeat this process for any OU that you have migrating workstations to ensure each workstation is allowing the domain local group the ability to authenticate so we can pre cache their credentials prior to cutover.
Once all the steps have been completed you should be able to successfully run the Cache Credentials action without error. If you are getting the below error for a workstation, ensure that the domain local group has been assigned the permission to authenticate to it.
Once migrations have completed you can safely tear down the trust relationship and remove any assigned permissions for the domain local group.
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