require 'net/ldap'
ldap = Net::LDAP.new(:host => '10.0.0.32', :port => 389)
if ldap.bind(:method => :simple, :username => "ttyler",
             :password => "********")
  # authentication succeeded
else
  # authentication failed
  p ldap.get_operation_result
end

#<OpenStruct extended_response=nil, code=49, error_message="80090308: LdapErr: DSID-0C0903A9, comment: AcceptSecurityContext error, data 52e, v1db1u0000", matched_dn="", message="Invalid Credentials">