net/telnet session times out

[Wybo Dekker]

I'm trying to run a telnet session with my adsl modem with

#!/usr/bin/env ruby

require 'net/telnet'

tn = Net::Telnet.new("Host" => "10.0.0.138",
"Timeout" => 5,
"Prompt" => /[$%#>] \z/n
)
tn.login("wybo", "my_password") { |c| print c }
tn.cmd("help") { |c| print c }
tn.close

But it just times out:

$ tn
/usr/local/lib/ruby/1.8/net/telnet.rb:551:in `waitfor': timed out while
waiting for more data (Timeout::Error)
from /usr/local/lib/ruby/1.8/net/telnet.rb:719:in `login'
from ./tn:9
$

What can be wrong with my script?