How to run the OpenSSH SSHD server on Windows using Cygwin

How to run the OpenSSH SSHD server on Windows using Cygwin
How to setup automatic login with ssh without a password

1. Install the following Cygwin packages (rerun setup if necessary -- you can add packages after you have already installed Cygwin).

   Admin --> cygrunsrv
   Net --> openssh

2. Open a new bash shell window and run the SSH configure stuff.

   ssh-host-config

   注意，在配置过程中，UsePrivilegeSeparation选择no。这样，sshd不会启动单独的线程，后面我们就有机会手工修改sshd_config。

3. Now you are ready to start the service.

   cygrunsrv -S sshd

   stop
   
   cygrunsrv -E sshd

4. Generate your key pair using the following command:
   $ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa

5. $ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

6. 修改/etc/sshd_config，使sshd能够使用到上一步生成的authorized_keys
   AuthorizedKeysFile    .ssh/authorized_keys

tips:
如何查看sshd服务器端的log信息
1. 修改/etc/sshd_config，打开LogLevel，并改为DEBUG。
2. 日志要通过administrative tools->Event Viewer查看，属于application log。

ssh -v 查看登录过程中的debug信息

http://www.noah.org/wiki/Sshd_on_Windows
http://magicmonster.com/kb/net/ssh/auto_login.html