title: Linux ssh passwordless login doesn't work?
body: <pre><code>bharathi-1397@bharathi-1397:~$ ssh-keygen 
  Generating public/private rsa key pair.
  Enter file in which to save the key (/home/local/bharathi-1397/.ssh/id_rsa): 
  /home/local/bharathi-1397/.ssh/id_rsa already exists.
  Overwrite (y/n)? y
  Enter passphrase (empty for no passphrase): 
  Enter same passphrase again: 
  Your identification has been saved in /home/local/bharathi-1397/.ssh/id_rsa.
  Your public key has been saved in /home/local/bharathi-1397/.ssh/id_rsa.pub.
  The key fingerprint is:
  de:e3:e5:f6:a3:8e:83:76:f0:7d:d6:e1:b3:d6:cc:93 bharathi-1397@bharathi-1397
  The key's randomart image is:
  +--[ RSA 2048]----+
  |                 |
  |                 |
  |                 |
  |                 |
  |        S        |
  |       ...     . |
  |        .+o.. .++|
  |        o.+=o +E=|
  |       . .o++=oo+|
  +-----------------+
  </code></pre>
  
  <p>Next i copy content's from .ssh/id_rsa.pub and stored in remote machine.</p>
  
  <pre><code> bharathikannan.r@172.20.2.7:~$ mkdir .ssh
   bharathikannan.r@172.20.2.7:~$ vi authorized_keys
  </code></pre>
  
  <p>paste the copied content into authorized_keys but next time i try to login it will ask password why ?
         ssh bharathikannan.r@172.20.2.7
         bharathikannan.r@172.20.2.7's password: </p>
  
  <p>Why it asking password ? . I follow the step's correctly . I don't know why it ask password ?</p>
  
  <pre><code>ssh -v bharathikannan.r@172.20.2.7
  OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: Applying options for *
  debug1: Connecting to integ-build3 [192.168.5.173] port 22.
  debug1: Connection established.
  debug1: identity file /home/local/bharathi-1397/.ssh/id_rsa type 1
  debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
  debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
  debug1: identity file /home/local/bharathi-1397/.ssh/id_rsa-cert type -1
  debug1: identity file /home/local/bharathi-1397/.ssh/id_dsa type -1
  debug1: identity file /home/local/bharathi-1397/.ssh/id_dsa-cert type -1
  debug1: identity file /home/local/bharathi-1397/.ssh/id_ecdsa type -1
  debug1: identity file /home/local/bharathi-1397/.ssh/id_ecdsa-cert type -1
  debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
  debug1: match: OpenSSH_4.3 pat OpenSSH_4*
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_5.8p1 Debian-7ubuntu1
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: server-&gt;client aes128-ctr hmac-md5 none
  debug1: kex: client-&gt;server aes128-ctr hmac-md5 none
  debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024&lt;1024&lt;8192) sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
  debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
  debug1: Server host key: RSA 66:3e:67:25:65:22:f0:70:3d:e3:ce:3b:14:49:7e:76
  debug1: Host '172.20.2.7' is known and matches the RSA host key.
  debug1: Found key in /home/local/bharathi-1397/.ssh/known_hosts:5
  debug1: ssh_rsa_verify: signature correct
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug1: SSH2_MSG_NEWKEYS received
  debug1: Roaming not allowed by server
  debug1: SSH2_MSG_SERVICE_REQUEST sent
  debug1: SSH2_MSG_SERVICE_ACCEPT received
  debug1: Authentications that can continue: publickey,gssapi-with-mic,password
  debug1: Next authentication method: publickey
  debug1: Offering RSA public key: /home/local/bharathi-1397/.ssh/id_rsa
  debug1: Authentications that can continue: publickey,gssapi-with-mic,password
  debug1: Trying private key: /home/local/bharathi-1397/.ssh/id_dsa
  debug1: Trying private key: /home/local/bharathi-1397/.ssh/id_ecdsa
  debug1: Next authentication method: password
  bharathikannan.r@172.20.2.7's password: 
  </code></pre>