How To Fix the “no hostkey alg” SSH Error Message on Older MacOSX
erics, Posted April 9th, 2025 at 12:15:47pm
The included, MacOSX-native ssh binary does not support newer SHA2 keys, so it gets the dreaded “no hostkey alg” error.
To fix that, install ssh via homebrew or macports and use that binary instead:
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shell> ssh myserver ls no hostkey alg shell> which ssh /usr/bin/ssh shell> find /opt -name ssh /opt/local/bin/ssh ... shell> /opt/local/bin/ssh -V OpenSSH_9.9p2, OpenSSL 3.4.1 11 Feb 2025 shell> /opt/local/bin/ssh myserver The authenticity of host 'myserver (1.2.3.4)' can't be established. ED25519 key fingerprint is SHA256:Mmx6y1Z/example+/sbw. This key is not known by any other names. Are you sure you want to continue connecting (yes/no/[fingerprint])? yes Warning: Permanently added 'myserver' (ED25519) to the list of known hosts. Activate the web console with: systemctl enable --now cockpit.socket Last login: Wed Apr 9 10:04:50 2025 from 4.5.6.7 shell> logout |
Categories: How-To's, Technology alg, Error, hostkey, howto, MacOS, macosx, no hostkey alg, ssh, tips
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