I experienced the "operation not permitted" problem as many others have.
I had not changed my setup when the error was experienced, but I noticed
that every computer which presented this difficulty was a work machine with
our IT security suite installed. On every PC _without_ an IT security
package, cygwin sshd worked just fine out of the box. On any PC without a
security package which subsequently had one installed, sshd stopped working.
Like at least one other user, I have concluded that my "evil" IT people are
the root cause of the problem. However, they are of no help whatsoever. By
some combination of dumb luck, relentless hacking and bits of help online, I
arrived at the following conslusions and solution:
Problem one: by default, cygwin sshd uses the windows log, which is hard to
read and doesn't contain the desired diagnostic output. Fixing this revealed
useful clues.
Problem two: /var/empty had the incorrect owner.
THE FIX:
1) Setup cygwin's sshd normally by invoking: ssh-host-config -y (If you have
been thrashing about trying to solve this problem and have changed
permissions and config files, just run the script again to ensure that your
setup is reasonable)
2) DON'T START sshd.
3) Issue "chown SYSTEM /var/empty"
4) Uninstall the default sshd service by invoking: cygrunsrv --remove sshd
5) Reinstall the service and make the sshd output go to /var/log/sshd.log by
invoking: cygrunsrv -I sshd -d "Cygwin sshd" -p /usr/sbin/sshd -a '-D -e'
I hope this works for you.
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