require 'rubygems'
require 'net/ssh'


begin
        Net::SSH.start("1.2.3.4", "root", :password=>"secret") do |ssh|
                        puts "connected"
                end

rescue
        puts "something wrong"
end

# manual ssh to host returns "Connection closed by 1.2.3.4"
# net-ssh doesn't raise exception, continues attempting connection