title: Can not setup SSH Key correctly
body: <p>I try to connect to a Gitlab Server and want to setup SSH for this. I followed the steps on Gitlab but the connection fails. Here my output of testing the connection:</p>
  
  <pre><code>$ ssh -Tvvv git@XXXX-gitlab.XXXX.com
  OpenSSH_8.2p1, OpenSSL 1.1.1e  17 Mar 2020
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug2: resolving "XXXX-gitlab.XXXX.com" port XX
  debug2: ssh_connect_direct
  debug1: Connecting to XXXX-gitlab.XXXX.com [XX.XX.XX.XXX] port XX.
  debug1: Connection established.
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_rsa type 0
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_rsa-cert type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_dsa type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_dsa-cert type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ecdsa type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ecdsa-cert type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ecdsa_sk type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ecdsa_sk-cert type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ed25519 type 3
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ed25519-cert type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ed25519_sk type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_ed25519_sk-cert type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_xmss type -1
  debug1: identity file /c/Users/XXXXXXXX/.ssh/id_xmss-cert type -1
  debug1: Local version string SSH-2.0-OpenSSH_8.2
  debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2p2 Ubuntu-4ubuntu2.8
  debug1: match: OpenSSH_7.2p2 Ubuntu-4ubuntu2.8 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
  debug2: fd 3 setting O_NONBLOCK
  debug1: Authenticating to XXXX-gitlab.XXXX.com:22 as 'XXXXXXXX'
  debug3: hostkeys_foreach: reading file "/c/Users/XXXXXXXX/.ssh/known_hosts"
  debug3: record_hostkey: found key type ECDSA in file /c/Users/XXXXXXXX/.ssh/known_hosts:1
  debug3: load_hostkeys: loaded 1 keys from XXXX-gitlab.XXXX.com
  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-group14-sha256,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,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,ssh-ed25519,sk-ssh-ed25519@openssh.com,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,3des-cbc,aes256-cbc,aes192-cbc
  debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,aes256-cbc,aes192-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@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-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@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
  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:uE1tRPH243kfpd9Q/MN10WAk5DsZ0tTCleo20sqQ4Vc
  debug3: hostkeys_foreach: reading file "/c/Users/XXXXXXXX/.ssh/known_hosts"
  debug3: record_hostkey: found key type ECDSA in file /c/Users/XXXXXXXX/.ssh/known_hosts:1
  debug3: load_hostkeys: loaded 1 keys from XXXX-gitlab.XXXX.com
  debug3: hostkeys_foreach: reading file "/c/Users/XXXXXXXX/.ssh/known_hosts"
  debug3: record_hostkey: found key type ECDSA in file /c/Users/XXXXXXXX/.ssh/known_hosts:1
  debug3: load_hostkeys: loaded 1 keys from XX.XX.XX.XXX
  debug1: Host 'XXXX-gitlab.XXXX.com' is known and matches the ECDSA host key.
  debug1: Found key in /c/Users/XXXXXXXX/.ssh/known_hosts:1
  debug3: send packet: type 21
  debug2: set_newkeys: mode 1
  debug1: rekey out 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 in after 134217728 blocks
  debug1: Will attempt key: /c/Users/XXXXXXXX/.ssh/id_rsa RSA SHA256:p06ps84qa4QzJTeCOxlodXX/Ml2sGv8doOOdoNxpRIo
  debug1: Will attempt key: /c/Users/XXXXXXXX/.ssh/id_dsa
  debug1: Will attempt key: /c/Users/XXXXXXXX/.ssh/id_ecdsa
  debug1: Will attempt key: /c/Users/XXXXXXXX/.ssh/id_ecdsa_sk
  debug1: Will attempt key: /c/Users/XXXXXXXX/.ssh/id_ed25519 ED25519 SHA256:Sk3ubA/kcWl2l1p6OlAELC47Ra7j+7p28df/n8gGFTu
  debug1: Will attempt key: /c/Users/XXXXXXXX/.ssh/id_ed25519_sk
  debug1: Will attempt key: /c/Users/XXXXXXXX/.ssh/id_xmss
  debug2: pubkey_prepare: done
  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;rsa-sha2-256,rsa-sha2-512&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
  debug3: start over, passed a different list publickey,password
  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 public key: /c/Users/XXXXXXXX/.ssh/id_rsa RSA SHA256:p06ps84qa4QzJTeCOxlodXX/Ml2sGv8doOOdoNxpRIo
  debug3: send packet: type 50
  debug2: we sent a publickey packet, wait for reply
  debug3: receive packet: type 51
  debug1: Authentications that can continue: publickey,password
  debug1: Trying private key: /c/Users/XXXXXXXX/.ssh/id_dsa
  debug3: no such identity: /c/Users/XXXXXXXX/.ssh/id_dsa: No such file or directory
  debug1: Trying private key: /c/Users/XXXXXXXX/.ssh/id_ecdsa
  debug3: no such identity: /c/Users/XXXXXXXX/.ssh/id_ecdsa: No such file or directory
  debug1: Trying private key: /c/Users/XXXXXXXX/.ssh/id_ecdsa_sk
  debug3: no such identity: /c/Users/XXXXXXXX/.ssh/id_ecdsa_sk: No such file or directory
  debug1: Offering public key: /c/Users/XXXXXXXX/.ssh/id_ed25519 ED25519 SHA256:Sk3ubA/kcWl2l1p6OlAELC47Ra7j+7p28df/n8gGFTu
  debug3: send packet: type 50
  debug2: we sent a publickey packet, wait for reply
  debug3: receive packet: type 51
  debug1: Authentications that can continue: publickey,password
  debug1: Trying private key: /c/Users/XXXXXXXX/.ssh/id_ed25519_sk
  debug3: no such identity: /c/Users/XXXXXXXX/.ssh/id_ed25519_sk: No such file or directory
  debug1: Trying private key: /c/Users/XXXXXXXX/.ssh/id_xmss
  debug3: no such identity: /c/Users/XXXXXXXX/.ssh/id_xmss: No such file or directory
  debug2: we did not send a packet, disable method
  debug3: authmethod_lookup password
  debug3: remaining preferred: ,password
  debug3: authmethod_is_enabled password
  debug1: Next authentication method: password
  git@ch-s-gitlab.ch.abb.com's password:
  </code></pre>
  
  <p>What seems suspicious is the file permissions:</p>
  
  <pre><code>$ ls -la ~/.ssh
  total 27
  drwxr-xr-x 1 XXXXXXXX 1049089    0 Apr 11 11:34 ./
  drwxr-xr-x 1 XXXXXXXX 1049089    0 Apr  9 17:20 ../
  -rw-r--r-- 1 XXXXXXXX 1049089  464 Apr 11 11:34 id_ed25519
  -rw-r--r-- 1 XXXXXXXX 1049089  105 Apr 11 11:34 id_ed25519.pub
  -rw-r--r-- 1 XXXXXXXX 1049089 3389 Apr  9 08:05 id_rsa
  -rw-r--r-- 1 XXXXXXXX 1049089  749 Apr  9 08:05 id_rsa.pub
  -rw-r--r-- 1 XXXXXXXX 1049089  383 Apr 14 08:00 known_hosts
  </code></pre>
  
  <p>I tried to change these permissions with the command  <code>chmod 600 ~/.ssh/id_rsa*</code> but it does not change the output from above. Can you help me please?</p>