Run sshd under cygwin

From Cygwin SSHD HowTo

1. install Admin/cygrunsrv and Net/openssh
2. in cygwin, ssh-host-config -y
3. when prompted with "CYGWIN=", type tty ntsec
4. net start sshd / cygrunsrv --start sshd

other settings

* /etc/passwd
* /etc/sshd_config
　ListenAddress 127.0.0.1

* Cygwin must be installed for "all user"
* If no prompt as 3. , try restart the computer