Unable to start asp.net debugging at IIs 5 with URLScan

From: Ya Ya (ra294@hotmail.com)
Date: 03/03/03

From: "Ya Ya" <ra294@hotmail.com>
Date: Mon, 3 Mar 2003 17:46:43 +0200

When creating a new ASP.net application and trying to debug it I am getting
the error:
"Unable to start debugging on the web server. Server side-error occurred on
sending debug HTTP request"

I have IIS 5 with URLScan on Windows 2000 Server.
I added "DEBUG" in URLScan.ini and allowed aspx and aspc files.
I have not touch the web.config file of the application.

Any idea what can cause the problem ?