Start Visual Studio: Open the Visual Studio project or solution that is associated with your IIS website.

Configure IIS: Verify that your IIS website is set up and operational. If not, set it up by making a fresh website or utilizing an already-existing one.
Build Configuration: Verify that the configuration for your project contains debugging details. Usually, the "Debug" setting would be utilized.
Begin debugging: Click on the "Start Debugging" button in Visual Studio (or press `F5`). This will connect the debugger and start your application.
Attach to Process: To attach the debugger to an already-running IIS website, go to the "Debug" menu, pick "Attach to Process," and select the process that corresponds to your IIS application pool (in most cases, `w3wp.exe} for IIS worker processes).
Choose the Appropriate Code: Verify that the source code you wish to debug is the same one that IIS is using. Make sure the right project and build configuration are chosen by checking the configuration of the solution.
Establish Breakpoints: Whenever you want the debugger to pause so you may walk through the code and examine variables, place breakpoints in your code.
Debugging: You can now debug your IIS website once it has been attached. At the breakpoints, Visual Studio will pause, allowing you to step through code, examine variables, and troubleshoot problems with the debugging tools.

Keep in mind that in order to attach the debugger to the IIS process and adjust the IIS application pool settings appropriately, you should have the required permissions for efficient debugging.

You should be able to connect the Visual Studio debugger to your IIS website in order to debug it by following these instructions.