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I have a home NAS and a Windows 10 PC. I have enabled the following services in the stock control panel: UPnP/DLNA, SMB, FTP, and WebDAV. I am able to access all the folder/files using any of these services except for one subfolder and that only from Windows Explorer (i.e. SMB). That is, trying to access \\SHARE\folder\subfolder1\subfolder2 will give me Windows cannot access error in Windows Explorer, while I'm able to access it via ftp, DAV, and through stock web file browser.

Here's the interesting part: I tried changing the ownership and the permissions in the Security properties panel (right click > Properties > Security). First error I get is that permissions are incorrectly ordered. I am able to proceed by acknowledging, and I'm then given the option to Reorder them, that I also can get through. But trying to actually change the owner or the principal or any other ownership relation for that matter always results in Failed to enumerate objects in the container. Access is denied error - always, not matter what I try.

Trying to takeownership or icacls just returns Access is denied, regardless of my admin privileges.

There is nothing funny or strange in the subfolder2 name, no special characters.

How can I troubleshoot this and figure out what to do to be able to enter the folder via Windows Explorer/SMB?

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OK, so the most random and bizarre thing happened. I will leave a reply here in case someone else has a similar problem.

As I mentioned, one of the services I had enabled on the NAS was FTP. I logged into the share folder via FTP (using Windows Explorer - I just typed the ftp://local.address/folder/subfolder1 in the address bar. I right clicked on the subfolder2 that was giving me the issues and the dialog that came up was much simpler than the standard Windows Explorer properties dialog. As in, I saw only one tab and in it, among other information, the check-boxes to set read/write permissions for different users. The only checkbox that was not ticked off was actually Read for All users. I ticked it off and suddenly everything works. I can now access subfolder2 right from the Windows Explorer, just like any other folder.

All in all, I find this all pretty idiotic, but I'm out of the woods. I hope this helps others as well.

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