Is there an SSH client for DOS 6.22 or Windows 3.1 that supports certificates and could be used to connect to AWS or Azure instances, or any other server for that matter? I have another laptop restoration I'm hoping to finish this week, want to find a cool purpose for it rather than just sit there and gather dust.
How about SSH2DOS?
SSH2DOS v0.2.1+SHA256.1 patch by Antti Takala https://github.com/AnttiTakala/SSH2DOS Released on 04-14-2021
The aim was to update the ciphers and protocols to more 2021 standards so the programs would be usable with current ssh servers without the need to change the server configuration to allow less secure connection methods.
If you could use Java on Windows 3.1 there is a SSH client written in pure Java that would work. I use one on a desktop Java system that has been running for 12 years on Windows to avoid having an SSH tunnel. If it works on an old version of Java that still runs on 3.1 is another question.