Mail360 Server - error when browsing Numserverweb UI "HTTP error 500.19 internal server error"


HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.
Detailed Error Information:
Module          IIS Web Core
Notification    BeginRequest
Handler           Not yet determined
Error Code      0x800700b7
Config Error    There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined
Config File       \\?\D:\Group1\MAIL360 Server Web Client\NumServer Web\web.config
Requested URL    http://vm-5f25-4c79:8080/NumServerweb
Physical Path    D:\Group1\MAIL360 Server Web Client\NumServer Web
Logon Method    Not yet determined
Logon User         Not yet determined

The error above is encountered when user tries to log onto MAIL360 Server UI.
In this scenario, the user has installed Mail360 Server 2.1 version on Win 2012 server.



During the installation of Mail360 server 2.1 version on Win 2012 server, a configuration issue had this error:
On Browsing the numserverweb UI, this error happened: HTTP error 500.19

In Win2012 , the DefaultAppPool is of v4.0 .NET framework, whereas Numserverweb UI requires v2.0 .NET framework, because of this the error arises.


UPDATED: March 24, 2017
Follow the below steps to change ApplicationPool 2.0 framework.

Open the Internet Information Services (IIS) Manager of the server on
which you have planned to install the Web UI,  ( start -> inetmgr )
2. Select the virtual directory ( NumServerWeb ) -> Go Advanced Settings -> Change the Applicationpool to .NET 2.0
3. Reset IIS
4. Browse the Site again and verify.

Environment Details
Operating System: Windows 2012