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This article will tell you some situations for this error and how to troubleshoot it.
If you open your ASP.NET Web Project or Web Service Project, you may see the error message: "Visual Studio .NET has detected that the specified Web server is not running ASP.NET version 1.1. You will be unable to run ASP.NET Web applications or services."
This problem causes when Visual Studio.NET cannot find Web Server specified by Web Project, Web Server is stopped, or Project location is incorrect.
1. Your Web Server (IIS) doesn't register .NET Framework's ASP.NET mapping or cannot be found. 2. .NET Framework 1.1 Runtime doesn't installed. 3. Web Server specified by ASP.NET Web Project/Web Service Project is stopped or IP address cannot be mapped. 4. Web Server specified by ASP.NET Web Project/Web Service Project cannot be found.
1. Your Web Server (IIS) doesn't register .NET Framework's ASP.NET mapping. A: Please open command prompt, and type "aspnet_regiis -i" to register ASP.NET mapping information.
3. Web Server specified by ASP.NET Web Project/Web Service Project is stopped or IP address cannot be mapped. A: Please check IIS's Web configuration, include IP Address and working status. If your network IP address already changed, you must change your Web Site's IP Address. (If you use "localhost" to create Web Project, you can do nothing.)
4. Web Server specified by ASP.NET Web Project/Web Service Project cannot be found. A: Please open your Web Project's solution file by using notepad (or other text editor), find your ASP.NET Web Project record, it will look like: