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sign_and_send_pubkey: no mutual signature supported

Posted at

たまにしかssh接続しない環境に久しぶりにMacからアクセスしたところ、以下のエラーでアクセスできなくなっていた。

sign_and_send_pubkey: no mutual signature supported

以下のようにPubkeyAcceptedKeyTypesとHostKeyAlgorithmsを指定すれば解決した。

Host myhost
  Hostname xxx.xxx.xxx.xxx
  User myuser
  IdentityFile ~/.ssh/mykey.pem
+  PubkeyAcceptedKeyTypes=+ssh-rsa
+  HostKeyAlgorithms=+ssh-rsa

MacOSのバージョンアップによってsshクライアントがデフォルトでRSAをサポートしなくなったんだろうか。推奨される方法でキーの再作成がベストらしいが、とりあえず接続はできるようになりました。

参考
https://stackoverflow.com/questions/73795935/sign-and-send-pubkey-no-mutual-signature-supported

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