Cannot remove group from folder security

Hi all,

First-time poster here. I am administrating the server where I work now and am attempting to restrict user access to specific folders. We use a ReadyNAS Pro 2, which has a configuration for user and group accounts. Everyone's assigned to the same group.

To restrict permissions to a folder, I have attempted to navigate to it in File Explorer (Windows 10), right-click on the folder, go to Properties, and click on the Security tab, where I see the groups and users with assigned permissions to that folder. By default, it shows two groups called "Everyone" and the main group configured on the ReadyNAS, as well as what appears to be a user with the name of the Share as defined in the ReadyNAS admin panel. I click on the Edit button, add myself as a user with "Full Control" permissions, and remove the groups that were there before.

However, when I click "Apply", one of two things happen. Either I get a error message that says,"An error occurred while applying security information to: [folder path]. Failed to enumerate objects in the container. Access is denied" OR, with other folders, instead of the error message, the groups I deleted is repopulated.

Can someone please advise what I could be missing? I have no formal training with network administration, and this very well could be a novice-level question. But so far, I have not been able to find an answer through my normal means of Googling.

Thanks in advance!
Michael

Welcome to the form. I am not clear what your editing NTFS or something else you must always add permission before you try and remove. If you remove everyone that will include you so you must add your rights first or you could be locked out

Sorry, I'm probably going to get some of the tech speak wrong, but the server is a Windows NT system. In the Security tab for one of the folders in question, I have already added my individual user account as having full permissions and applied changes. I still cannot remove the other groups or revoke their permissions.

Are the permission set to inherit from folder above?

Whether I enable or disable inheritance, the behavior is the same, i.e. when I try to delete the group from the Security list, when I hit "Apply", the group reappears with "Full Control" permissions. Very weird.