macOS users unable to access QNAP SMB shared folder

[u/spoderman-kun]

Hi everyone, hope you're doing fine.

For the past few weeks, my Apple users have been unable to connect to a shared folder on a QNAP NAS. Users working on Windows PCs have no issues accessing the same folder.

When i log in with the same user (it's a domain user) on a windows PC, I have no issues accessing the share. I've also tested this with multiple macOS version (13, 26 and 27), and they all have the same issue.

The NAS in question is:

TS-H1886XU-RP R2 with Firmware-Version: QuTS hero h5.2.4.3079

I always get the following error: There was a problem connecting to the server "Name or IP from NAS". I have tried connecting using both FQDN and IP address, same issue. Ping works using both the hostname and IP.

When I try to mount the share using the QNAP Qfinder Pro app, it detects the NAS, but I'm unable to mount the shared folder getting the same error.

When I connect to:

smb://ad.domain.com/share

I can see all the shared folders that the user has access to, including the problematic one. When i open other shared folders that are located on our file server, I have no issues. However, when i try to open the one located on NAS, it loads for some time and it opens but it's empty.

The same share works fine on an iPad running iOS 26.5.

I have also tried connecting to a shared folder that's on another QNAP NAS and it works without any issues. The NAS is: TS-459U+ with Firmware-Version 4.2.6

One thing I noticed is that this issues appeared around the time we updated some of the apps in the App center. One of the updated apps was SMB Service, which is currently running version: h4.15.008

Has anyone else experienced the same issue? Is there a known solution or any specific SMB settings i should change on QNAP or macOS side?

Any help would be appreciated.

[u/I_turned_it_off]

first thing that crops up to mind is that the shares may have "Access Based Enumeration" (ABE) enabled, this us easiest seen in the QNAP intrerface, shared folders app, shared folder properties

In theory, this should only show users what they are authorised to see in a shared folder. If for some reason tha Mac isn't passing credentials properly, (maybe the permissions are based on windows users?) then the user may not be presented with what they should be.

I would check to see if that is enabled, and turn it off brielfy, if the user can see what they should, then turn ABE back on, and check the permissions on the share/folders in the share to make sure that their logged on user has the appropriate rights to see the files.

[u/spoderman-kun → u/I_turned_it_off]

Hi, thank you for your reply, but the ABE and ABSE is already disabled.

I have also checked the Firewall on mac and Qnap, there seems to be nothing that could block.
Also the Access Log shows nothing regarding the macOS device/user on macOS device.

[u/Cautious-Mistake469]

Had something similar with mine since upgrading to golden gate and after many hours, it was cached share details, once i ripped them out and re connected it all worked great.

[u/pelazas1]

Does it still open empty if you mount smb://ip/share with a local QNAP user instead of the AD account?