Visual InterDev
The debugger is unable to automatically enable debugging for the Microsoft® Internet Information Server (IIS) application.
Do you want to continue launching the debugger? If you choose Yes, you can view the file in the debugger and in the browser, but will not be able to debug.
For details about server debugging options, see Debugging Server Script. For information about manually enabling debugging on the server, see the topic "Enabling ASP Debugging on the Server" in Troubleshooting.