title: Cygwin ssh: lost connection after accessing remote host with id_rsa, id_rsa.pub keys
body: <p>My goal is to copy files programatically from remote server to local computer. Both running Windows with Cygwin (server) and computer Cygwin 64.</p>
  
  <p>Before I create rsa or dsa keys I can copy files by entering Password</p>
  
  <p>But after creation of these files, I have "connection closed by remote host. lost connection" error</p>
  
  <p>I gave following rights: "chmod 600 .ssh/id_rsa" (on local computer) and chmod 600 ".ssh/authorized_keys2". What is the problem who can answer to me?</p>
  
  <pre><code>    $ ssh login@hiddenhost
      Connection to hiddenhost closed by remote host.
      Connection to hiddenhost closed.
  
      PC003370+procserver@ATMPROCSERVER ~
      $ ssh -v login@hiddenhost
      OpenSSH_7.2p2, OpenSSL 1.0.2g  1 Mar 2016
      debug1: Reading configuration data /etc/ssh_config
      debug1: Connecting to hiddenhost [hiddenhost] port 22.
      debug1: Connection established.
      debug1: identity file /home/procserver/.ssh/id_rsa type 1
      debug1: key_load_public: No such file or directory
      debug1: identity file /home/procserver/.ssh/id_rsa-cert type -1
      debug1: key_load_public: No such file or directory
      debug1: identity file /home/procserver/.ssh/id_dsa type -1
      debug1: key_load_public: No such file or directory
      debug1: identity file /home/procserver/.ssh/id_dsa-cert type -1
      debug1: key_load_public: No such file or directory
      debug1: identity file /home/procserver/.ssh/id_ecdsa type -1
      debug1: key_load_public: No such file or directory
      debug1: identity file /home/procserver/.ssh/id_ecdsa-cert type -1
      debug1: key_load_public: No such file or directory
      debug1: identity file /home/procserver/.ssh/id_ed25519 type -1
      debug1: key_load_public: No such file or directory
      debug1: identity file /home/procserver/.ssh/id_ed25519-cert type -1
      debug1: Enabling compatibility mode for protocol 2.0
      debug1: Local version string SSH-2.0-OpenSSH_7.2
      debug1: Remote protocol version 2.0, remote software version OpenSSH_7.1
      debug1: match: OpenSSH_7.1 pat OpenSSH* compat 0x04000000
      debug1: Authenticating to hiddenhost:22 as 'login'
      debug1: SSH2_MSG_KEXINIT sent
      debug1: SSH2_MSG_KEXINIT received
      debug1: kex: algorithm: curve25519-sha256@libssh.org
      debug1: kex: host key algorithm: ecdsa-sha2-nistp256
      debug1: kex: server-&gt;client cipher: chacha20-poly1305@openssh.com MAC: &lt;implicit
      &gt; compression: none
      debug1: kex: client-&gt;server cipher: chacha20-poly1305@openssh.com MAC: &lt;implicit
      &gt; compression: none
      debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
      debug1: Server host key: ecdsa-sha2-nistp256 SHA256:TS6tXfpxXyW/KeIWFnvxCsmEhHy8
      8NyoBA3DdOHzjFw
      debug1: Host 'hiddenhost' is known and matches the ECDSA host key.
      debug1: Found key in /home/procserver/.ssh/known_hosts:1
      debug1: rekey after 134217728 blocks
      debug1: SSH2_MSG_NEWKEYS sent
      debug1: expecting SSH2_MSG_NEWKEYS
      debug1: rekey after 134217728 blocks
      debug1: SSH2_MSG_NEWKEYS received
      debug1: SSH2_MSG_SERVICE_ACCEPT received
      debug1: Authentications that can continue: publickey,password,keyboard-interacti
      ve
      debug1: Next authentication method: publickey
      debug1: Offering RSA public key: /home/procserver/.ssh/id_rsa
      debug1: Authentication succeeded (publickey).
      Authenticated to hiddenhost ([hiddenhost]:22).
      debug1: channel 0: new [client-session]
      debug1: Requesting no-more-sessions@openssh.com
      debug1: Entering interactive session.
      debug1: pledge: network
      debug1: channel 0: free: client-session, nchannels 1
      Connection to hiddenhost closed by remote host.
      Connection to hiddenhost closed.
      Transferred: sent 1944, received 1312 bytes, in 0.0 seconds
      Bytes per second: sent 647995.5, received 437330.3
      debug1: Exit status -1
  
      PC003370+procserver@ATMPROCSERVER ~
      $
  </code></pre>