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how to set ssh server on ubuntu

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

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