[ssh] Starting ssh-agent on Windows 10 fails: 'unable to start ssh-agent service, error :1058'

I get the same error in Cygwin. I had to install the openssh package in #Cygwin Setup.
(The strange thing was that all ssh-* commands were valid, (bash could execute as program) but the openssh package wasn't installed.)
#ssh #service #windows-10 #openssh