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"Visual Studio .NET has detected that the specified Web server is not running ASP.NET version...

Posted Date: 12 Sep 2006	Resource Type: Articles	Category: .NET Framework
Author: Harish Ranganathan	Member Level: Gold
Rating:	Points: 10

Introduction

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."

Why this Error occurs?

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 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.
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.

Summary

This has been one of the most annoying errors many developers face and I have close to 500 people
benefited from the above fixes. Hence thought of sharing this with all.

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