I have a file share on a Windows 2008 R2 server in a AD domain (call it \SECURESERVER\STUFF) and I am not sure if I have the share and folder permissions set up right. I noticed the problem when I set up new server (WORKGROUP\FOREIGNSERVER) that was not joined to the domain and tried to copy some files off of \SECURESERVER\STUFF. I was surprised to find that when I tried to access the files, it did not prompt me for a username and password and proceeded to give me full access to the files. That worried me so I tried the same thing on some workstations that were not in the domain and they did NOT have the same behavior (they did prompt for a username/password as desired/expected). So, I think there is something peculiar about FOREIGNSERVER. I am logging into it with a local admin account, but my domain and SECURESERVER should know nothing of this server. I've carefully gone through the share and folder permissions on the share but I can't find the reason that FOREIGNSERVER has access. How can I find out why FOREIGNSERVER has access to SECURESERVER?