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--- ssh-key-login-not-working [2021/09/20 17:33] – created baumi
+++ ssh-key-login-not-working [2022/05/02 09:23] (current) – baumi
@@ Line 1: / Line 1: @@
 ====== 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}}