Network error

WinSCP 5.7.3 last version which normally working with this server in local network.
What is the problem ? Install dropbear-0.52-1 SSH server, update not possible.
https://www.youtube.com/watch?v=1GQXsl7savM

Why cannot you update your server? The dropbear-0.52-1 seems to be 15 years old. That's something you should never use.