I access my Synology NAS via AFP and can open/edit all of my files directly on it. But when I copy a file to my desktop I can't open it. Finder tells me I don't have appropriate permissions.

When I look at the permissions (CMD + I) on …

… my NAS:

  • (unknown): read & write
  • everyone: no permissions

… my desktop:

  • staff: read & write
  • everyone: no permissions

ls -l will print (for both paces): ----rwx--- 1 suntrop staff 35354 4 Jul 10:32 File.docx

Is this a problem on the Mac or Synology or my settings?

  • 1
    The permissions should ideally be 755, i.e., rwxr-xr-x at both places.
    – duci9y
    Sep 20, 2012 at 9:14
  • Ok, thanks. And what causes the problem or how to avoid it? :-)
    – suntrop
    Sep 20, 2012 at 11:03
  • I don’t know what caused the problem or how to avoid it, but you can probably fix it by running sudo chmod -R 755 /path/to/drive in the Terminal. That’s why I didn’t put this as an answer.
    – duci9y
    Sep 20, 2012 at 11:06
  • That's not only this particular file. Almost all files have this problem. anyway, I'll check some other resources and try to fix it. Thanks.
    – suntrop
    Sep 20, 2012 at 16:52
  • No, I did not say path/to/file, I said path/to/drive. This will fix ALL files on the drive.
    – duci9y
    Sep 20, 2012 at 17:04

3 Answers 3


Sounds like a permission problem. I had a similar issue. Files created by one user in two groups (administrator & user) on NAS were not being able to read by users only in the user group. I tried reseting ownership/permissions using File Station from DiskStation and did nothing. I figured something was wrong with root folder permissions on shared folder - and yes, they were owned by root and 777 chmod.

I've managed to fix this by:

  1. On the Synology - control panel - win/mac/nfs - goto Mac File Serivce (AFP) and turn off Apply default UNIX permissions (Mac file services enabled) - root of your problem
  2. log on to NAS via ssh, go to most root shared folder and do

    chown -R nobody:users shared_folder/
    chmod -R 755 shared_folder/

used info from here, here and here.


In my case, I discovered that if I close the folder in the finder there's no problem with permissions. If the folder is open and displayed, then I get the message that I can't save my file due to the fact that I don't have the necessary permissions. Go figure, but it works here every time.


Do not connect via AFP: use SMB.

  • 5
    Why should they connect via SMB instead of AFP? While this might be exactly right, some more explanation would be nice.
    – Cajunluke
    Oct 8, 2012 at 18:29
  • Although SMB will work it doesn't support some of the OS X features I like. I submitted a bug report to Apple and – I hope – they fix it :-)
    – suntrop
    Oct 9, 2012 at 20:44
  • Synology had to reverse engineer AFP, whereas SMB is open source. That's why SMB is safer to use, especially with newer OS X versions Mar 17, 2015 at 12:47

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