Re: SSH problem from BasicLinux floppy booted 486 to Fedora 25

[Philip Rhoades]

Jakub,

On 2017-03-13 23:43, [e-mail] wrote:
> Date: Mon, 13 Mar 2017 09:55:42 +0100
> From: Jakub Jelen 
> Subject: Re: SSH problem from BasicLinux floppy booted 486 to Fedora
>    25
> To: [e-mail], Community support for Fedora users
>    
> Message-ID: 
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> On 03/13/2017 07:02 AM, Philip Rhoades wrote:
> > People,
> >
> > I get an error trying to ssh from a BasicLinux floppy booted 486 (I 
> > want
> > to sort out HD problems on the old Adaptec 1542 controlled SCSI drive
> > that has RH5.2 on it!) when trying to connect to my Fedora 25 x86_64
> > workstation.  On the F25 machine in /var/log/secure I get lines like:
> >
> > Mar 13 16:25:47 phil sshd[7562]: Unable to negotiate with 192.168.1.40
> > port 1034: no matching key exchange method found. Their offer:
> > diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 
> > [preauth]
>
> You are connecting from very old OpenSSH client (3.5), which does not
> support any of the currently secure cryptography algorithms. You should
> really consider updating that BasicLinux.

There will probably be a very infrequent need to boot that computer - 
once I rsync everything off it, the HD will probably only be used for 
odd testing after that.  Also, I am already using 3 floppies to boot the 
machine - an up-to-date BL will be bigger and use more floppies etc etc
> Otherwise you can enable the legacy kex and ciphers in the Fedora
> OpenSSH server by following these instructions:
>
> http://www.openssh.com/legacy.html

Perfect!  Thanks for that - I can reverse using the legacy stuff after I 
recover the data from the old machine.

Regards,

Phil.