Things to check, if SSH key login is not working

authorized_keys contains correct public key

authorized_keys file has permisions 600

.ssh directory has permissions 755 or more restrictive

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

userauth_pubkey: signature algorithm ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]

Workaround: add “PubkeyAcceptedKeyTypes=+ssh-rsa” to /etc/ssh/sshd_config and restart sshd

Fix: Regenerate your public/private keypair