title: SSH: localhost closes connection after successful login
body: <p>When I try to ssh into localhost, it accepts the public key and immediately closes the connection. I've been going through pages of Google results for hours now with no progress. Here's what I get after <code>ssh -v user@localhost</code>:  </p>
  
  <pre><code>OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011
  debug1: Reading configuration data /Users/user/.ssh/config
  debug1: Reading configuration data /etc/ssh_config
  debug1: /etc/ssh_config line 20: Applying options for *
  debug1: Connecting to localhost [::1] port 22.
  debug1: Connection established.
  debug1: identity file /Users/user/.ssh/id_rsa type -1
  debug1: identity file /Users/user/.ssh/id_rsa-cert type -1
  debug1: identity file /Users/user/.ssh/id_dsa type 2
  debug1: identity file /Users/user/.ssh/id_dsa-cert type -1
  debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9
  debug1: match: OpenSSH_5.9 pat OpenSSH*
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_5.9
  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 67:2f:0b:c8:40:e8:87:0f:57:ee:c7:68:ae:8a:5a:02
  debug1: Host 'localhost' is known and matches the RSA host key.
  debug1: Found key in /Users/user/.ssh/known_hosts:1
  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,keyboard-interactive
  debug1: Next authentication method: publickey
  debug1: Trying private key: /Users/user/.ssh/id_rsa
  debug1: Offering DSA public key: /Users/user/.ssh/id_dsa
  debug1: Server accepts key: pkalg ssh-dss blen 433
  debug1: read PEM private key done: type DSA
  Connection closed by ::1
  </code></pre>
  
  <p>I'm running OSX 10.8, using ssh through Terminal.</p>