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Do you want to try that and see if it makes a difference? > > I have no problems with /cygdrive/g/cygwin -- my socket file gets created there with proper > permissions and reported so, too (both fstat and stat). Right, I understood that. But the (default) ACL on that directory influences the ACL on subdirectories that are created. And there's also interaction between the default ACL and the umask (https://man7.org/linux/man-pages/man2/umask.2.html). So I think it couldn't hurt to try my suggestion and then see if you continue to see weird behavior on newly created subdirectories. I just tried this myself on an external hard drive on which I've never touched the permissions on the top-level directory. I do see some weirdness (though not as extreme as yours), and the weirdness goes away when I change the ACL as I suggested you do. Here's what I see. [Note: I use /mnt as the cygdrive prefix.] $ pwd /mnt/d $ getfacl . # file: . # owner: Administrators # group: Unknown+Group user::--- group::rwx #effective:--- group:SYSTEM:rwx #effective:--- mask::--- other::rwx default:user::rwx default:group::--- default:group:SYSTEM:rwx #effective:--- default:mask::--- default:other::rwx $ mkdir cygwin $ cd cygwin/ $ getfacl . # file: . # owner: kbrown # group: None user::rwx group::r-x group:SYSTEM:rwx #effective:r-x mask::r-x other::r-x default:user::rwx default:group::r-x default:group:SYSTEM:rwx #effective:r-x default:mask::r-x default:other::rwx $ ./sun fstat mode = 140666 stat mode = 140646 $ ls -l .socket srw-r--rw- 1 kbrown None 0 2022-07-02 09:47 .socket= $ mkdir sub $ cd sub $ ../sun.exe fstat mode = 140666 stat mode = 140646 $ ls -l .socket srw-r--rw- 1 kbrown None 0 2022-07-02 09:49 .socket= $ cd .. $ getfacl ~ | setfacl -f - . $ getfacl . # file: . # owner: kbrown # group: None user::rwx group::r-x other::r-x default:user::rwx default:group::r-x default:other::r-x $ mkdir sub1 $ cd sub1 $ ../sun.exe fstat mode = 140666 stat mode = 140666 $ ll .socket srw-rw-rw- 1 kbrown None 0 2022-07-02 10:04 .socket= Note that stat and fstat disagreed at first but then agreed after I put a standard ACL on the cygwin directory. Having said all that, I still want to look into why stat and fstat disagree. Ken