"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" - Updated

A very common but weird error we get when trying to create / open asp.net applications using visual studio.net is "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 error occurs primarily due to following reasons
1. IIS installed after Visual Studio .NET is installed.
2. ASPNET Account removed / doesnt have sufficient permissions.
3. Script Mappings not updated in the IIS
4. Proxy Settings

Resolution 1
The resolution for the first 3 reasons is simple. Reinstall

Version Numbers for other versions

.NET Framework 2.0 - v2.0.50727 for Visual Studio 2005 (Released Version)

.NET Framework 1.0 - v1.0.3705 for Visual Studio .NET 2002

Resolution 2

The other resolution for proxy settings is as follows:-

1. Open Internet Explorer

2. Go to Tools - Internet Options - Connections - LAN Settings - Advanced

3. Under “Do not use Proxy server for addresses beginning with“, enter localhost or your local IP starting number in the Text Area.

4. Clik Ok 3 times to exit.

5. Restart Visual Studio .NET and you should be able to create ASP.NET Applications.

Feel free to write back or post alternative solutions in the comments section, if the above solutions doesnt solve the issue.




Note: I thank all of you who have expressed their gratitude and thanks for this solution.  I have updated this article with the second set of steps involving proxy settings.


the aspnet user account.  To do that, type the following from your command prompt:-
%windir%\Microsoft.NET\Framework\v1.1.4322\aspnet_regiis.exe -i

the above is based on .net 1.1 version (Visual Studio .NET 2003). For other versions, just change the version number.

Print | posted on Monday, April 25, 2005 7:30 AM

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