"Daniele B.": > I went to my Mac (SSH -V: OpenSSH 6.9p1 LibreSSL 2.1.8) and launched > ssh-keygen produced for my my user a nice RSA key. I grabbed it and I > went on my > cloud server (SSH -V: OpenSSH 9.2p1 OpenSSL 3.0.9) and appended it in > my .ssh/authorized_keys.
While RSA _keys_ are still supported, the RSA signature _algoritm_ has changed: rsa-sha2-{256,512} is used nowadays and the old ssh-rsa scheme has been disabled by default. rsa-sha2 was introduced with OpenSSH 7.2, so 6.9 is too old. The easiest solution is to use an Ed25519 key, supported since OpenSSH 6.5: $ ssh-keygen -t ed25519 -- Christian "naddy" Weisgerber na...@mips.inka.de