Thanks, Les and Iosif for the headsup on that link. It explained the
problem OK.

So my plan now is rather than changing the crypto used, is to convert my
small home network to use ECDSA keys over the weekend. Hope things go Ok.

Regards,
Tony

On Wed, 6 Mar 2024 at 17:04, Iosif Fettich <ifett...@netsoft.ro> wrote:

> > Thanks, yes the real problem is with the configuration of sshd on CS-9.
> It seems to be slightly different than on CS-8. So I don't have ssh working
> on the CS-9 box yet. I get the
> > following error when I try to ssh between accounts even on the laptop
> box itself.
> >
> >     sshd[2608]: refusing RSA key: Invalid key length [preauth]
> >     sshd[2608]: Accepted password for root from 192.168.1.8 port 35958
> ssh2
> >
> > So I was hoping for the test of BackupPC that running a manual backup
> when the ssh login failed that it would fall back and ask for a password.
> This is just a test laptop and I
> > wanted to make sure all the services I regularly use were working on it
> before I upgraded my home network.
> >
> > So it's back to sorting out sshd.
>
> Have a look for that on
>
>
> https://serverfault.com/questions/1095898/how-can-i-use-a-legacy-ssh-rsa-key-on-centos-9-stream
>
> Maybe it helps.
>
> Iosif Fettich_______________________________________________
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>
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