====== Things to check, if SSH key login is not working ======
===== Permission issues =====

  - authorized_keys contains correct public key
  - authorized_keys file has permisions 600
  - .ssh directory has permissions 755 or more restrictive

===== Key Exchange Issues =====

  - Newer versions of openssh do no longer accept ssh-rsa as public key algorithm
  - To diagnose add "Loglevel DEBUG3" to /etc/ssh/sshd_config and restart sshd
  - /var/log/auth.log should then contain the following line <code>
userauth_pubkey: signature algorithm ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]
</code>
  - Workaround: add "PubkeyAcceptedKeyTypes=+ssh-rsa" to /etc/ssh/sshd_config and restart sshd
  - Fix: Regenerate your public/private keypair

{{tag>kb ssh}}