BUG: "Unable to start debugging on the Web server" error message when you run an ASP.NET Web application (814717)


The information in this article applies to:

  • Microsoft .NET Framework 2.0
  • Microsoft .NET Framework 1.1
  • Microsoft .NET Framework 1.0
  • Microsoft Visual Basic 2005
  • Microsoft Visual Basic .NET (2003)
  • Microsoft Visual Basic .NET (2002)
  • Microsoft Visual C# 2005, Express Edition
  • Microsoft Visual C# .NET (2003)
  • Microsoft Visual C# .NET (2002)

SYMPTOMS

You create an ASP.NET Web application by using localhost as the Web server, and you change the Web site setting in Internet Information Services (IIS) to use the specific IP address for Web Site Identification. Then, when you run the application, you receive the following error message:
Error while trying to run project: Unable to start debugging on the web server. Could not start ASP.NET or ATL Server debugging.

Verify that ASP.NET or ATL Server is correctly installed on the server.

CAUSE

This problem occurs because the debugger does not send the debug action to IIS when you run the application. The debugger identifies your computer as localhost. However, in IIS, the Web Site Identification of the application is the IP address that you specified.

RESOLUTION

  1. In a text editor such as Notepad, open the WebApplicationName.vbproj.webinfo file. The WebApplicationName.vbproj.webinfo file is located in the application folder for your application.
  2. Locate the following line. 
     <Web URLPath = "http://localhost/WebApplicationName/WebApplicationName.vbproj" />
    Replace the local host with the IP Address of your computer as follows.
     <Web URLPath = "http://10.150.144.131/WebApplicationName/WebApplicationName.vbproj" />
  3. Start Microsoft Internet Explorer. On the Tools menu, click Internet Options.
  4. In the Internet Options dialog box, click the Security tab. Under Select a Web content zone to specify its security settings, click Local Intranet, and then click Sites.
  5. In the Local Intranet dialog box, click Advanced.
  6. In the Add this Web Site to the zone box, type the URL of your project, and then click Add.
  7. Close the application, and then open the application again.
  8. On the Debug menu, click Start.

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

Steps to reproduce the problem

  1. In Visual Studio 2005 or in Visual Studio .NET, create a new Web Application or a new Web site project by using Visual Basic 2005, Visual Basic .NET, Visual C# 2005, or Visual C# .NET. In the New Project dialog box, type http://localhost/testapp in the location box.
  2. Click Start, click Run, type inetmgr, and then click OK.
  3. In Internet Information Services (IIS) Manager, expand (local computer), and then locate Default Web Site.
  4. Right-click Default Web Site, and then click Properties.
  5. In the Default Web Site Properties dialog box, click the Web Site tab. In the IP address list, click the IP address of your computer. Click OK, and then quit IIS Manager.
  6. On the Debug menu, click Start.

REFERENCES

For more information, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn.microsoft.com/library/en-us/vbcon/html/vbconintroductiontowebapplicationdebugging.asp

Modification Type:MinorLast Reviewed:10/3/2006
Keywords:kbvs2005applies kbvs2005swept kbvs2002sp1sweep kbpending kberrmsg kbSerial kbIP kbWebServer kbWebForms kbWebBrowser kbbug KB814717 kbAudDeveloper
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