cfarm211 sshd is old

[Bruno Haible]

Hi Dagobert,

Since I just upgraded to a new Linux distro version, that ships with

  $ ssh -V
  OpenSSH_10.2p1 Ubuntu-2ubuntu3.2, OpenSSL 3.5.5 27 Jan 2026

I cannot connect to cfarm211.cfarm.net any more. The login to 
cfarm210.cfarm.net, on the other hand, works.

What is the difference?

cfarm210 (OK):

debug1: Local version string SSH-2.0-OpenSSH_10.2p1 Ubuntu-2ubuntu3.2
debug1: Remote protocol version 2.0, remote software version OpenSSH_10.2
debug1: compat_banner: match: OpenSSH_10.2 pat OpenSSH* compat 0x04000000

cfarm211 (FAIL):

debug1: Local version string SSH-2.0-OpenSSH_10.2p1 Ubuntu-2ubuntu3.2
debug1: Remote protocol version 2.0, remote software version Sun_SSH_2.4
debug1: compat_banner: no match: Sun_SSH_2.4

debug2: KEX algorithms: diffie-hellman-group-exchange-sha256,diffie-hellman-
group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,ssh-dss


The background:
  - ssh-dss is disabled in OpenSSH 10.
  - I don't have an ssh-rsa key.
  - I have an ssh-ed25519 key, but that is apparently not supported by
    Sun_SSH_2.4.

Could you please install OpenSSH sshd on cfarm211, like you did on cfarm210?

Thanks!

Bruno