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Samba HowTo Guide
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Samba maps some of the DOS attribute bits (such as “read-only”) into the UNIX permissions of a file. This means there can be a conflict between the permission bits set via the security dialog and the permission bits set by the file attribute mapping.

If a file has no UNIX read access for the owner, it will show up as “read-only” in the standard file attributes tabbed dialog. Unfortunately, this dialog is the same one that contains the security information in another tab.

What this can mean is that if the owner changes the permissions to allow himself or herself read access using the security dialog, clicks on OK to get back to the standard attributes tab dialog, and clicks on OK on that dialog, then NT will set the file permissions back to read-only (as that is what the attributes still say in the dialog). This means that after setting permissions and clicking on OK to get back to the attributes dialog, you should always press Cancel rather than OK to ensure that your changes are not overridden.

Samba HowTo Guide
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