Rails - Jul 2009 - invalid binding information

Hello everyone
i am working on a web application where i need to authenticate our
company user''s with our active directory/ldap server.

i am using ruby-net-ldap gem for that purpose and getting the following
error

Net::LDAP::LdapError in LoginController#authenticate
"invalid binding information"

Application Trace
=============/home/mubashir/.gem/ruby/1.8/gems/ruby-net-ldap-0.0.4/lib/net/ldap.rb:1097:in
`bind''
/home/mubashir/.gem/ruby/1.8/gems/ruby-net-ldap-0.0.4/lib/net/ldap.rb:701:in
`bind''
/home/mubashir/mis/lib/ldap_connect.rb:9:in `authenticate''
/home/mubashir/mis/app/controllers/login_controller.rb:10:in
`authenticate''

====================================================================Here is the
flow of my program
i ve put ldap_connect.rb in my lib folder with the following code

require ''net/ldap''
module LDAP
  def self.authenticate(user, password)
    if user == "" || password == ""
      return false
    end
    ldap_con = Net::LDAP.new({:host => ''203.155.2.3'',
         :auth=>{:method=>:simple,:username => user,:password =>
password } } )
    return true if ldap_con.bind
    return false
  end
end

And in my login controller in have put the following method

def authenticate
    if session[:person] == LDAP.authenticate(params[:login][:name],
params[:login][:password])
      session[:username]=params[:login][:name]
        redirect_to :controller => ''application''
    else
      flash[:notice] = "Login failed!"
      redirect_to :action => "index"
    end
  end

WOuld any body help me, how i can solve this issue.

Thanks
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