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Mac credentials being requested when trying to save to a NAS Folder in Finder

My client is running an environment with 8 macbooks and 1 iMac. Software on the systems ranges from 10.7.4 to 10.8.4. Users are connecting to the NAS through finder (go>connect to server>IP of server>connect>NAS credentials.)

When user 1 is connected to the NAS w/NAS credentials they are able to create folders without a problem. They can take files out, add files to the folder, etc. However, if user 2, also logged into the NAS through finder, tries to save anything to the folder user 1 created, user 2 is asked for local Apple credentials. Basically, only the person who created the folder can edit the contents of the folder, and they can only do it from the computer the folder was created on. In their collaborative environment, this just doesn't work. They are sharing files that reach into the hundreds of MBs range due to the nature of their business.

I really am stumped as to why this suddenly started happening after 4 months. Is it tied to an apple update? I have not updated the firmware on the NAS or on the HDD's due to my fear that making any configuration changes to the device tends to break it, as has happened in the past. The suggestion has been made internally that the device is using AFP and should be using CIFS. I cannot find, in the NAS, what protocol is being used!
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jhyiesla
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Not sure why this would just start happening. I doubt that an Apple update caused this. Did the user perhaps start creating new folders in a hew spot that perhaps has different permissions on it?  As far as format, if the Mac can read and write to it, format is probably not the issue. If you can mount a folder to a Mac Finder and then right-click on it and Get Info, that should tell you want the format is.

While you're in the Get Info on one of these folders take a look at permissions and see if perhaps user 1 just doesn't have the necessary permissions. I know that I find in the Windows world that if I create a folder on a server for a user and then give it the proper permissions that many times works way better than if I let the user create their own folders and try and do the permissions right. I think a lot of the time it depends on the folders above and how the permissions dribble down; that's why I asked if the user may have started creating folders under a new spot.
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This should have been discovered much faster (although this has been resolved for some time, it still took WAY too long to diagnose). In the process, we did discover how to access the NAS via SSH as well.