MobileRead Forums - View Single Post - Kindle3 can telnet and ssh with pass but cannot with keys

amar · 06-11-2025, 02:14 PM

I kind of found a solution when looking for this 'Pubkey auth attempt with unknown algo for'
After I added these options and changed my key from ed25519 to rsa (3072)

Code:

ssh -i ~/.ssh/id_kindle root@192.168.2.2 -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedAlgorithms=+ssh-rsa

I finally could connect properly without giving any password

Actually it works even when I don't specify my key like above so ssh-agent is working fine as well.

I tried also with RSA 4096 and worked as well on both Dropbear and OpenSSH and it's working.
Trying to change to ed25519 didn't work yet but I guess I don't need it anymore or will look for specific options later (I tried '+ssh-ed25519' but there might be a different option).

In the end I checked and with only this one option I can login with my RSA key so this is a solution:

Code:

ssh root@192.168.2.2 -o PubkeyAcceptedAlgorithms=+ssh-rsa

Of course one could make it permanent so that there is no need to specify it in the CLI anymore:

Code:

vim ~/.ssh/config
        Host k3
        Hostname k3
        User root
        HostKeyAlgorithms ssh-rsa
        PubkeyAcceptedAlgorithms ssh-rsa

The question is though why there is no information on the forum or in the instructions and why is this needed?
Nobody faced this issue or maybe nobody uses ssh keys?

06-11-2025, 02:14 PM	#9
amar Junior Member Posts: 8 Karma: 10 Join Date: Jun 2025 Device: Kindle3 Keyboard	I kind of found a solution when looking for this 'Pubkey auth attempt with unknown algo for' After I added these options and changed my key from ed25519 to rsa (3072) Code: ssh -i ~/.ssh/id_kindle root@192.168.2.2 -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedAlgorithms=+ssh-rsa I finally could connect properly without giving any password Actually it works even when I don't specify my key like above so ssh-agent is working fine as well. I tried also with RSA 4096 and worked as well on both Dropbear and OpenSSH and it's working. Trying to change to ed25519 didn't work yet but I guess I don't need it anymore or will look for specific options later (I tried '+ssh-ed25519' but there might be a different option). In the end I checked and with only this one option I can login with my RSA key so this is a solution: Code: ssh root@192.168.2.2 -o PubkeyAcceptedAlgorithms=+ssh-rsa Of course one could make it permanent so that there is no need to specify it in the CLI anymore: Code: vim ~/.ssh/config Host k3 Hostname k3 User root HostKeyAlgorithms ssh-rsa PubkeyAcceptedAlgorithms ssh-rsa The question is though why there is no information on the forum or in the instructions and why is this needed? Nobody faced this issue or maybe nobody uses ssh keys?