Simple LDAP query

I'm using ruby-1.8.6 and trying to query my Windows Active Directory
LDAP server. But I'm getting connection failed. I can ping the AD
server, I can resolve the host name or the IP address and I know the
LDAP authentication is working. But I'm still getting error message
when I query it via the following script. The error message I get is
"fail!"

Could anyone please tell me what I'm doing wrong? Do I need to define
the base DN?

#!/usr/bin/ruby
require 'rubygems'
require 'net/ldap'

ldap = Net::LDAP.new
ldap.host = "ldap.domain.com"
ldap.port = 389
ldap.auth "user_ID", "password"
if ldap.bind
print "success!\n"
# authentication succeeded
else
print "fail!\n"
# authentication failed
end

.

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