Regarding cipher problems, it's easy to load or build PuTTY on most platforms, up to the 0.76 release when it ditched autoconf. At a minimum, it will build psft

Regarding cipher problems, it's easy to load or build PuTTY on most platforms, up to the 0.76 release when it ditched autoconf. At a minimum, it will build psftp, pscp and plink. These are handy on an older server. The tinysshd server also has rigorous security, and can be compiled on older systems. One problem with it is that root cannot be locked out. There is a legacy page maintained by OpenSSH, with guidance on a few deprecated features: https://www.openssh.com/legacy.html https://www.openssh.com/legacy.html And nobody should ever be using protocol 1, as it's been completely compromised. If absolutely necessary, then isolate it as much as possible.