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HI All

I hope you guys can help me, I am getting an the following error when trying to debug my Vs2005 applications.

"Unable to start debugging on the web server.Unable to connect to the web server. Verify that the web server is running and that HTTP incoming requests are not blocked by firewall."

Please help me eliminate this problem.

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  • Latest Post Latest Post by serkan sendur

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As suggested, app-pool compatibility is one possible cause, but several other issues commonly produce the same failure to start a debug session from Visual Studio 2005. The checklist below gives practical, ordered checks that are safe to run on a dev machine or server and will usually reveal the underlying problem.

  • Confirm IIS is running and the site is started in IIS Manager (World Wide Web Publishing Service).
  • From the machine that runs Visual Studio, browse the project URL (... or the configured port) to confirm the site responds.
  • Verify the project’s web settings match the IIS site URL and port. If remote debugging is intended, ensure the URL is reachable from the dev PC.
  • Check Windows/third‑party firewall rules for the site port (80 or custom) and for the remote debugger if used.
  • Make sure server-side debugging is allowed: the application is configured as an IIS application and web.config has compilation set for debugging (for example, debug="true" while diagnosing; remove in production).
  • Confirm the app pool’s .NET CLR version matches the app (VS2005 apps normally target .NET 2.0) and try the other pipeline mode if running on IIS7+; if that fixes it, inspect handlers/modules for compatibility.
  • Run Visual Studio elevated (or attach manually to the w3wp process) to test attach permissions. Check Event Viewer for ASP.NET/IIS errors and recycle the app pool or run iisreset if needed.

If these steps don’t show the cause, capture the site URL, app pool CLR version, and any Event Log entries — those details pinpoint whether it is a connectivity, permission, or framework-registration issue.

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Member Avatar for serkan sendur

"To enable debugging with visual studio, open up the iis again and right click to your web application, select Advanced Settings. In the behaviour section there is Application Pool property choose the "Classic .Net AppPool" from the options"

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