A.2.4 Will you write an SSH server for the PuTTY suite, to go with the client?

Not one that you'd want to use.

While much of the protocol and networking code can be made common between a client and server, to make a useful general-purpose server requires all sorts of fiddly new code like interacting with OS authentication databases and the like.

A special-purpose SSH server (called Uppity) can now be built from the PuTTY source code. But it's not usable as a general-purpose server. Its purpose is to be a test harness.

If someone else wants to use this as a basis for writing a general-purpose SSH server, they'd be perfectly welcome to, of course. But they would have to take responsibility for all of the security hardening that hasn't been done; we don't have time for that, and we don't have motivation. The code is available if anyone else wants to try it.