class Net::SSH::Proxy::SOCKS4

def initialize(proxy_host, proxy_port = 1080, options = {})

with which to authenticate.
Optionally, a :user key may be given to identify the username
Create a new proxy connection to the given proxy host and port. 
def initialize(proxy_host, proxy_port = 1080, options = {})
  @proxy_host = proxy_host
  @proxy_port = proxy_port
  @options = options
end