If you are using vagrant, you probably-statistically are using git. Make sure you have its binary folder on your path, because that path contains 'ssh.exe'.
Now, modify C:\vagrant\vagrant\embedded\lib\ruby\gems\1.9.1\gems\vagrant-1.0.3\lib\vagrant\ssh.rb
to comment out the faulty Windows check and add a real SSH check:
# if Util::Platform.windows?
# raise Errors::SSHUnavailableWindows, :host => ssh_info[:host],
# :port => ssh_info[:port],
# :username => ssh_info[:username],
# :key_path => ssh_info[:private_key_path]
# end
which = Util::Platform.windows? ? "where ssh >NUL 2>&1" : "which ssh >/dev/null 2>&1"
raise Errors::SSHUnavailable if !Kernel.system(which)
Now you can do vagrant ssh
. Happy camper again!
Vagrant 1.8.1 file is moved yet again - C:\HashiCorp\Vagrant\embedded\gems\gems\vagrant-1.8.1\lib\vagrant\util