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Are you using a Samba server and having problems with Mac OS X 10.6.3 clients copying files to your shares? You’re probably the victim of “wide links”. This issue seems to arise when someone upgrades to 10.6.3 specifically. The error message “The operation can’t be completed because you don’t have permission to access some of the items.” will appear, with no errors in the smbd logs.

The solution (well, the workaround until this is “fixed”) is to add the following to your smbd.conf:

wide links = no

or further-reaching:

unix extensions = no

Restart smbd and you should find your Samba client issues resolved. There are some performance issues with disabling wide links, as each file will require extra processing on each open (it is actively preventing smb from following symbolic links to files outside the file share).

If you upgrade to the very latest Samba versions, you will find wide links disabled by default. If you do disable them, consider using getwd cache = yes, to get some extra performance by caching paths to files.