I have user documents redirected to a share on a server. The share is \\Server1\UserDocs\%username%
I don't want the users to be able to navigate to \\Server1\UserDocs\ and view each others documents. How can I prevent this from happening?
You use NTFS permissions on each %username% folder that are set in such a way that only the user, and possibly an administrator, can see it.
After reading your comment, you seem to be missing an important detail. In situations like this, you typically break inheritance on each %username% folder and replace the permissions that would be inherited from the parent folder with explicit permissions for the user. If you're using redirected folders via GPO, it will automatically do this. If you're manually creating the folders, you'll have to do this by hand or script it. So, they will be able to see that other user folders exist, but they will get an access denied when trying to open them.