I\'ve been using capistrano successfully for a while now and all of a sudden in every project I\'ve lost the ability to deploy.
Environment:
Upgrading your net-ssh version to 2.8.1 will solve the problem. They released a version bump in 19th february 2014 that fix this and other problems.
Just paste this on your Gemfile:
gem 'net-ssh', '~> 2.8.1', :git => "https://github.com/net-ssh/net-ssh"
Run bundle install