Please help with openssh downgrade!
 

Hello everyone,

The o/s is Ubuntu 22.04 aarch64
And I’m trying to downgrade openssh 8.9p1, openssl 3.0.2 to openssh 7.4p1.

Somehow I keep getting the following screen when
apt-get purge openssh-server
apt-get purge openssh-client
apt-get purge openssh-sftp-server
are deleted and
openssh-server_7.6p1-4_arm64.deb
openssh-client_7.6p1-4_arm64.deb
openssh-sftp-server_7.6p1-4_arm64.deb
are installed,

root@arm64:/mnt/ssh# dpkg -i openssh-server_7.6p1-4_arm64.deb
(Reading database ... 77290 files and directories currently installed.)
Preparing to unpack openssh-server_7.6p1-4_arm64.deb ...
Unpacking openssh-server (1:7.6p1-4) over (1:7.6p1-4) ...
dpkg: dependency problems prevent configuration of openssh-server:
libc6:arm64 (2.35-0ubuntu3.1) breaks openssh-server (<< 1:8.2p1-4) and is installed.
Version of openssh-server to be configured is 1:7.6p1-4.

dpkg: error processing package openssh-server (--install):
dependency problems - leaving unconfigured
Processing triggers for ufw (0.36.1-4build1) ...
Processing triggers for man-db (2.10.2-1) ...
Errors were encountered while processing:
openssh-server
root@arm64:/mnt/ssh#

So I get this when installing openssh-server_7.6p1-4_arm64.deb package.
(I have already installed all the depend packages.)

Can anyone tell me why this is happening and how to fix it please?

Thank you in advance!

Hello. What problem are you trying to solve by attempting that?

Hello!

I’m trying to downgrade because of Putty and Filezilla versions!

More details are needed about your situation, but newer versions of PuTTY and FileZilla are what you need.

...which is not really an answer. You don't say what the version of either of those programs has to do with SSL/SSH, but downgrading security is *NEVER, EVER* a good idea. Why don't you UPGRADE Putty/Filezilla instead???

Windows comes with proper OpenSSH, so you can stop using Putty if you want.

Just open a cmd window and type 'ssh user@192.168.x.x'

It's there on the Pro editions of Windows by default, but is easily added to the Home version.

yes, in general you must not downgrade openssl. From the other hand you can use other clients, not only putty on windows. (see for example here: https://medevel.com/top-12-best-ssh-...s-for-windows/)