connectionstring failure
===

can somebody help me with the following problem?

I've developed an ASP.net application with login page on my laptop, i've a local SQL database on my laptop with several tables. It works like this; in visual studio i debug my APP, my login page opens and i log in with my credentials, it works!
But, i moved the application to a dedicated server, i installed als a sql server on that machine with OS W2003 server, i imported the tables en copied my ASP files, IIS is also installed! When i try to browse to my website, i get the folowing error;(in the connectionstrin i changed the ip adres!)

Server Error in '/' Application.
--------------------------------------------------------------------------------

Configuration Error 
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. 

Parser Error Message: Unrecognized configuration section 'connectionString'

Source Error: 
    
    <configuration>
    <connectionString>
      <add name="TelefoonConnectionString" connectionString="Data Source=172.30.111.174;Initial Catalog=Telefoon;Integrated Security=True"
       providerName="System.Data.SqlClient" />

>Source File: C:\Telefoon\Telefoon\web.config    Line: 9 

