In IIS:
- Set up Classic ASP website in IIS.
- Set Classic ASP application to allow ASP debugging:
- Click on application
- Double-click IIS/ASP
- Open Debugging Properties
- Enable Server-side Debugging = True
- Click Apply
- Add breakpoints in server-side code of Classic ASP.
- Start debugging:
- Debug Menu/Attach to Process/Available Processes
- Select w3wp.exe
- Click Attach