Unable to connect to sshd 10 in Gentoo #243
Description
There are no common crypto algorithms:
2025-06-24 16:33:05 Allocated garden:gentoo-cloud.
2025-06-24 16:33:05 Connecting to garden:gentoo-cloud...
2025-06-24 16:33:25 Cannot connect to garden:gentoo-cloud: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2025-06-24 16:33:25 Cannot connect to garden:gentoo-cloud: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2025-06-24 16:33:29 Cannot connect to garden:gentoo-cloud: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2025-06-24 16:33:37 Cannot connect to garden:gentoo-cloud: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2025-06-24 16:33:45 Cannot connect to garden:gentoo-cloud: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2025-06-24 16:33:53 Cannot connect to garden:gentoo-cloud: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2025-06-24 16:34:01 Cannot connect to garden:gentoo-cloud: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2025-06-24 16:34:05 Discarding garden:gentoo-cloud, cannot connect: cannot connect to garden:gentoo-cloud: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
Gentoo uses sshd 10. Ssh from Ubuntu 25.05 CAN connect.
Having looked at the code I suspect we need to stop using default selection of algorithms and instead enable all of the insecure algorithms AND the default algorithms together. This will fix newer systems without breaking old systems.