I ran into this as well with 6.10. Unfortunately, my Unifi UDM-Pro doesn't let me use anything but RSA. You can add "-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa" without the quotes after SSH or SCP commands to go back to prior usage.
[6.10.0-rc8] RSA and DSA SSH keys do not work
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in Prereleases
Posted
I ran into this as well with 6.10. Unfortunately, my Unifi UDM-Pro doesn't let me use anything but RSA. You can add "-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa" without the quotes after SSH or SCP commands to go back to prior usage.
Obviously not as secure as some other algorithms, but Unifi doesn't seem to care... https://community.ui.com/questions/SSH-Weak-Key-Exchange-Algorithms-diffie-hellman-group1-sha1/7b23bfc9-1482-4b65-bdea-b34968216b29