Howto: Debug classic ASP pages with Visual Studio 2003

Right. This was damn fiddly to get going on my particular setup (Windows 2003 SP1/R2, IIS6 in native mode, Visual Studio 2003) and took much googling.
However, I've now got my dev machine nicely asking me if I want to open a new instance of VS to debug local ASP errors that occur when testing with IE (incidently, I have the same occuring for Javascript - much win).

So, I'm posting this a reference. Key changes I had to make are below, with the various source links down the bottom.

IIS

Web Sites > Properties
  Web Site
    Connections
      (1) Tick 'Enable HTTP Keep-Alives'
    Home Directory
      Configuration
        Mappings
          (2) Tick 'Cache ISAPI extensions' 
          (3) Edit the '.asp' Application extension and add DEBUG to the 'Verbs' section
        Debugging
          (4) Tick 'Enable ASP server-side script debugging'
        Cache Options [1]
          (5) Select 'Cache limited ASP files in memory' and set it to '1'
  Directory Security
    Edit 'Authentication and access control'
      (6) Tick 'Integrated Windows authentication'

^[1] Note that 'Cache Options' can only be set at the root 'Web Sites' level (as far as I know).

Visual Studio

Tools
  Options
    Debugging
      Just-In-Time
        (7) Tick 'Script'

Internet Explorer

Tools
  Internet Options
    Security
      Trusted Sites
        (8) Add the FQDN of the site you are debugging as a trusted site

RegEdit (May be needed on Win2003 SP1, requires a reboot to take effect)

(9) HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\DisableLoopbackCheck, DWORD, 1

Troubleshooting
a) JIT debugger kicks in, but VS can't find your ASP 'debug symbols'? See #5. It seems like the ASP debug symbols must be held in the IIS cache.
b) Receiving an 'unable to find webserver' error? See #9.

References:
VS.NET Debugging Whitepaper
MSDN VS Debugging Reference
General notes
http://aspadvice.com/blogs/ssmith/archive/2006/10/04/Debuggin-Failed-Because-Authentication-is-not-enabled.aspx(Added 07/10/06)