When I try to open PuTTY from WinSCP, I get the situation shown in the attached screen shot: "Unexpected SSH_MSG_UNIMPLEMENTED packet". This does not happen when I open PuTTY standalone, and it doesn't happen on my other computer.
I've looked on the net for solutions, but none of them I have found seem to work. The ones I have tried include changing the order of the key exchange algorithms (see https://www.youtube.com/watch?v=tywQX5wTKvQ) - I can't do this because I can't get to the PuTTY settings when PuTTY is launched within WinSCP. I saw some other suggestions involving firewalls etc, but none produced anything actionable. And I can't find any possibly relevant difference between the environments in my two computers.
~ Thanks in advance for your help!