You can often ssh from newer systems to older systems by telling ssh
that it's allowed to use older options.
For example, to connect from ubuntu 22 to centos 5, my .ssh/config file has
Host centos5.example.com
KexAlgorithms +diffie-hellman-group1-sha1
# ubuntu 22+ needs
HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedKeyTypes +ssh-rsa
and I left myself a reference to:
https://www.openssh.com/legacy.html
Hope someone finds that helpful - cheers
John
On Fri, 2023/08/04 09:58:44AM -0400, D. Hugh Redelmeier via talk
<[email protected]> wrote:
| Recent Fedora systems' SSH client won't access CentOS 6 servers.
|
| Unable to negotiate with x.y.z.w port 22: no matching host key type
| found. Their offer: ssh-rsa,ssh-dss
|
| (One should not still be running CentOS 6!)
|
| All my workstations run recent Fedora systems. How could I access this
| server?
|
| It turns out the Windows has an SSH client these days and it isn't as
| picky about ciphers as Fedora.
|
| It could well be that other Linux distros support older ciphers too.
|
| This isn't generally a good thing: those ciphers were retired due to
| security concerns.
| ---
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