Unable to start debugger on Older version of Visual Studio (2003) Under Windows 7
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For this project I needed to install and run VS 2003 on Windows 7 using IIS 6.0 with Framework 1.1 on my sever because there was old VS2003 C# code on a remote server that needed updating and did not have VS 2003 installed only the DLL, PDB, aspx, and aspx.cs files. After porting the code over and making the needed changes on my local server, I discovered that while I could browse the page, I could not run the page with debugger and got this error: "... Unable to start debugging on the web server. There is no managed code running in the process. In order to attach to a process with the .NET debugger, managed code must be running in the process before attaching." I then started the application without Debugger  and selected the w3wp.exe process for CLR in order to attach the process but I noticed that the process session was set to 0 and I still got that error again.

The following is done in IIS6 :

    Application created.
    DefaultAppPool (.NET framework 1.1 Integrated)(ApplicationPoolIdentity) is used
    Browsing the web page works OK. 
    Authentication has Integrated Windows and ASP.NET Impersonation enabled.
    I have runned aspnet_regiis from all the .net version in order
    Set debug="true" in the web.config.

Thanks much for your help