Visual InterDev's debugging features are useful for some people (I am not one of those people). But many people have problems getting them working, and keeping them working. This can be due to misconfigured systems from the get-go, or from installing software afterward that causes conflicts or errors that may not be visible.
One common misconception is that if you can install VI, you can run the *server* debugging tools. AFAIK, VI's debugging tools only run on Windows NT and Windows 2000... they will not run on Windows 9x clients (though client-only debugging can function). Also, they work best if they are running ON the server that is hosting the ASP files. Remote debugging works -- allegedly -- but reports I've heard grade it mediocre at best.
If you've already installed InterDev's server extensions, search for a file called VIDDBG.exe. From a command prompt, issue the following code:
<drive>:\<path>\VIDDBG.EXE /server > videbug.txt
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This will run diagnostics on the debugging tools, and may help you determine why they're not working. In any case, if you're going to be fixing them, you'll likely need to (re-)install the server extensions.
If you're running NT 4.0, you'll want to reinstall SP4 or greater before starting. Next, find the file SETUP.EXE in the \VID_SS\ folder on the CD-Rom (this will be on Disc 1 of Visual InterDev, or Disc 2 of Visual Studio Pro or Enterprise). Double-click this file to launch the installation. Finally, reinstall the latest service pack for Visual Studio (at the time of writing, that is SP4).
For more information on Visual InterDev debugging, see the following articles:
KB #244272 INFO: Visual InterDev 6.0 Debugging Resources
Microsoft Visual InterDev 6.0 Debugging If you are getting errors (e.g. 'Unable to contact web server') or are having trouble making debugging work, see the following KB articles:
KB #220166 PRB: Troubleshooting "Unable to Contact Web Server" in Visual InterDev
KB #195954 PRB: "Unable to Contact Web Server" Error Creating New Project
KB #194013 PRB: No Warning From VID Debugger If Connection to Server Fails
KB #167661 PRB: Visual InterDev Cannot Connect to PWS or Share
KB #191560 FIX: Contacting Web Server to Open Web Project Never Times Out