1. Install OpenSSH server sudo apt-get install openssh-server 2. Configure sudo vi /etc/ssh/sshd_config uncomment: #GSSAPIAuthentication yes #GSSAPIDelegateCredentials no RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile %h/.ssh/authorized_keys restart ssh server: sudo /etc/init.d/ssh restart 3. generate putty key. ssh-keygen ssh-keygen will generate two keys：private and public. We need to change the name of the public: cd ~/.ssh mv id_rsa.pub authorized_keys and copy private key id_isa to client machine, and delete the one on server machine. 4. log on PuTTyGen --> Load, select id_rsa --> passphrase --> Save PrivateKey PuTTy， Session: input server machine IP. Connection->SSH->Auth->Browse choose the private key you just saved