title: Ssh dsa key authentication fails
body: <p>I'm trying to log to openssh server installed in cygwin using a dsa key file generated using:</p>
  
  <pre><code>ssh-keygen -t dsa
  </code></pre>
  
  <p>I have copied my key to authorized_keys using:</p>
  
  <pre><code>ssh-copy-id -i ~/.ssh/id_dsa ltonon@localhost
  </code></pre>
  
  <p>I also configured ssh server in /etc/sshd_config (everything else was commented out by default):</p>
  
  <pre><code>PubkeyAuthentication yes
  AuthorizedKeysFile      .ssh/authorized_keys
  PasswordAuthentication yes
  PubkeyAcceptedKeyTypes=+ssh-dss
  </code></pre>
  
  <p>In /etc/ssh_config (everything else was commented out by default):</p>
  
  <pre><code>Host *
  PubkeyAcceptedKeyTypes=+ssh-dss
  </code></pre>
  
  <p>Now when I try to log in using:</p>
  
  <pre><code>ssh -vvvv -i .ssh/id_dsa ltonon@localhost
  </code></pre>
  
  <p>I have the following:</p>
  
  <pre><code>OpenSSH_7.5p1, OpenSSL 1.0.2k  26 Jan 2017
  debug1: Reading configuration data /etc/ssh_config
  debug1: /etc/ssh_config line 20: Applying options for *
  debug2: resolving "localhost" port 22
  debug2: ssh_connect_direct: needpriv 0
  debug1: Connecting to localhost [::1] port 22.
  debug1: Connection established.
  debug1: identity file .ssh/id_dsa type 2
  debug1: key_load_public: No such file or directory
  debug1: identity file .ssh/id_dsa-cert type -1
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_7.5
  debug1: Remote protocol version 2.0, remote software version OpenSSH_7.5
  debug1: match: OpenSSH_7.5 pat OpenSSH* compat 0x04000000
  debug2: fd 3 setting O_NONBLOCK
  debug1: Authenticating to localhost:22 as 'ltonon'
  debug3: hostkeys_foreach: reading file "/home/ltonon/.ssh/known_hosts"
  debug3: record_hostkey: found key type ECDSA in file /home/ltonon/.ssh/known_hosts:1
  debug3: load_hostkeys: loaded 1 keys from localhost
  debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
  debug3: send packet: type 20
  debug1: SSH2_MSG_KEXINIT sent
  debug3: receive packet: type 20
  debug1: SSH2_MSG_KEXINIT received
  debug2: local client KEXINIT proposal
  debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
  debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
  debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
  debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
  debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: compression ctos: none,zlib@openssh.com,zlib
  debug2: compression stoc: none,zlib@openssh.com,zlib
  debug2: languages ctos:
  debug2: languages stoc:
  debug2: first_kex_follows 0
  debug2: reserved 0
  debug2: peer server KEXINIT proposal
  debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
  debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
  debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
  debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
  debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: compression ctos: none,zlib@openssh.com
  debug2: compression stoc: none,zlib@openssh.com
  debug2: languages ctos:
  debug2: languages stoc:
  debug2: first_kex_follows 0
  debug2: reserved 0
  debug1: kex: algorithm: curve25519-sha256
  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
  debug3: send packet: type 30
  debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
  debug3: receive packet: type 31
  debug1: Server host key: ecdsa-sha2-nistp256 SHA256:3kIsOo83GqltRfLJY2uSGhsQZDVcY+BoTgl+YqvWYns
  debug3: hostkeys_foreach: reading file "/home/ltonon/.ssh/known_hosts"
  debug3: record_hostkey: found key type ECDSA in file /home/ltonon/.ssh/known_hosts:1
  debug3: load_hostkeys: loaded 1 keys from localhost
  debug1: Host 'localhost' is known and matches the ECDSA host key.
  debug1: Found key in /home/ltonon/.ssh/known_hosts:1
  debug3: send packet: type 21
  debug2: set_newkeys: mode 1
  debug1: rekey after 134217728 blocks
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug3: receive packet: type 21
  debug1: SSH2_MSG_NEWKEYS received
  debug2: set_newkeys: mode 0
  debug1: rekey after 134217728 blocks
  debug2: key: .ssh/id_dsa (0x60005ff20), explicit
  debug3: send packet: type 5
  debug3: receive packet: type 7
  debug1: SSH2_MSG_EXT_INFO received
  debug1: kex_input_ext_info: server-sig-algs=&lt;ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521&gt;
  debug3: receive packet: type 6
  debug2: service_accept: ssh-userauth
  debug1: SSH2_MSG_SERVICE_ACCEPT received
  debug3: send packet: type 50
  debug3: receive packet: type 51
  debug1: Authentications that can continue: publickey,password,keyboard-interactive
  debug3: start over, passed a different list publickey,password,keyboard-interactive
  debug3: preferred publickey,keyboard-interactive,password
  debug3: authmethod_lookup publickey
  debug3: remaining preferred: keyboard-interactive,password
  debug3: authmethod_is_enabled publickey
  debug1: Next authentication method: publickey
  debug1: Offering DSA public key: .ssh/id_dsa
  debug3: send_pubkey_test
  debug3: send packet: type 50
  debug2: we sent a publickey packet, wait for reply
  Authentication failed.
  </code></pre>
  
  <p>I'm lost here... Can you help me checking what I missed?</p>
  
  <p>Thanks a lot</p>