Failed to decrypt using provider 'RsaProtectedConfigurationProvider'?

Question

In my windows application i am trying to encrypt connection string section of app.config file, connection string part of my app.config file is

Answer 1

Using this command aspnet_regiis -pa

Open cmd Console -execute as Administrator-

C:\Windows\system32>aspnet_regiis -pa "NetFrameworkConfigurationKey" "myDomain\myUser"
Microsoft (R) ASP.NET RegIIS versión 4.0.30319.33440
Utilidad de administración que instala y desinstala ASP.NET en el equipo local.
Copyright (C) Microsoft Corporation. Todos los derechos reservados.
Agregando ACL para el acceso al contenedor de claves RSA...
Con éxito

More references:

Ɖiamond ǤeezeƦ answer

The RsaProtectedConfigurationProvider sometimes fails when encrypting an application configuration file

ASP.NET Encryption - aspnet_regiis - Farm

Encrypting and Decrypting Web.config Sections in .NET 4.0