I work in "C:\Users\leyou.ssh"
I need to chmod id_rsa to 600 as it's currently 644, but it has no effect.
Hence I tried "chgrp Users id_rsa" but it doesn't work neither and the group remains as "mkpasswd".
The above happens in a windows cmd (with C:\cygwin64\bin in %PATH%).
When I try from the cygwin bash, chgrp and chmod work, but when I run "ssh email@example.com" it fails saying that id_rsa is 644 even though I get 600 through ls -la.
It doesn't make sense at all...