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部署Rails 4.2.0应用与capistrano 3.5，并收到错误：Capistrano的3.5的Net :: SSH :: AuthenticationFailed：验证失败
这里是Deploy.rb有关ssh的行：
set :ssh_options, { forward_agent: true, user: fetch(:user), keys: %w(~/.ssh/mykey.ppk) }
mykey.ppk是所使用的关键在腻子上登录到服务器（aws实例）。
这里是bundle exec cap production deploy
cap aborted!
Net::SSH::AuthenticationFailed: Authentication failed for user [email protected]
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/net-ssh-3.1.1/lib/net/ssh.rb:246:in `start'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sshkit-1.10.0/lib/sshkit/backends/connection_pool.rb:59:in `call'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sshkit-1.10.0/lib/sshkit/backends/connection_pool.rb:59:in `with'
错误净SSH的当前版本是3.1.1。有一个关于降低net-ssh到2.7.0' on Capistrano 3.4. However Capistrano 3.5 requires net-ssh 2.8.0 or above. Tried net-ssh 3.1.0`的帖子，问题是一样的。还有什么可以解决第3.5章的问题？