On Sun, Dec 5, 2021 at 8:15 AM Richard W.M. Jones <rjones(a)redhat.com> wrote:
openssh 8.8p1 (just released in Rawhide) cannot connect to older
servers. The error is:
Unable to negotiate with [server] port 22: no matching host key type found. Their
offer: ssh-rsa,ssh-dss
It seems like the cut-off point is RHEL <= 6 broken, RHEL >= 7 is OK.
RHEL 6 is obsolete for more than the last year: retaining
compatibility with obsolete distributions of an operating system is
work that likely no one is pursuing. I used to do that sort of thing,
but no one is paying me for it right now. That sort of thing used to
be available at repoforge, but that repo stopped getting updates some
time ago.
I eventually found a workaround/solution to this deep in an Arch
thread:
https://bbs.archlinux.org/viewtopic.php?pid=2006291#p2006291
or the equivalent on the command line:
ssh -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedAlgorithms=+ssh-rsa rhel6
So..... you can set it up in ~/.ssh/config for specific remote hosts as needed?
> Both config options seem to be necessary.
>
> Rich.
>
>
> --
> Richard Jones, Virtualization Group, Red Hat
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