SSH Key Authentication Problem (and Solution)

Installation Home Assistant OS
1

I set up the SSH Server add-on and tried to get SSH running from MobaXTerm with public/private key authentication. I pasted the key from Putty Key Generator into the config box under the SSH Server configuration page. I loaded the public key file into the MobaXTerm session. But MobaXTerm SSH kept saying the login was refused and I kept getting this error in the SSH Server log:

Disconnected from authenticating user root 172.30.32.1 port 41632 [preauth]
Received disconnect from 172.30.32.1 port 41636:14: No supported authentication methods available [preauth]

I tried all kinds of things I found on the web.

  1. I found out that the private key file had Windows EOL characters and I converted them to Unix.
  2. I tried different formats of the public key string I pasted into Home Assistant SSH Server configuration page. Ultimately I returned to just copying it from the Putty Keygen and pasting it in (with enclosing quotes).
  3. I tried different formats of the private key file (like deleting the public key info from it) – just a WAG and it had no effect.

Finally, I found a post on the Ubuntu community about sshd problems. The following fixed it in HA.

Went into the Terminal Window on Home Assistant.
cd /etc/ssh
vi sshd_config
(added the following lines:)

PubkeyAuthentication yes
RSAAuthentication yes

One (or both) of those are what did it.

FYI.

2

What fixed it for me was modifying both keys to LF only.

3

Hello,

please what do you call "LF"?

Also I have tried to solution you proposed, but it seems that when I restart the SSH add-on in HA, the lines added in the sshd configuration files disappear.
Do I missed something?

Thank you
Thierry