HTTP Error 500.19 - Internal Server Error localhost


newbie here, I am having an error in all of my projects and backups when executing my project visual studio 2012. Last week it was working fine and then the error came out. I am just using localhost.

these are solutions that i found and it still didn't work: :(

-In IIS Manager - Feature Delegation set HandlerMapping to Read/Write.

-Control Panel, Turn windows features on or off, Internet Information Services, World Wide Web Services, enable Application Development Features except CGI.

-I gave IIS_IUSRS full control to my project folder.

Any other suggestions?

error message

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 0x80070003

Config Error Cannot read configuration file

Config File \?\C: -- web.config

Requested URL http://localhost:49926/Home.aspx

Physical Path --

Logon Method Not yet determined

Logon User Not yet determined

Request Tracing Directory
C:\Users\john\Documents\IISExpress\TraceLogFiles\ --

Config Source: -1: 0:

my [Web.config] file

<?xml version="1.0" encoding="utf-8"?>
  For more information on how to configure your ASP.NET application, please visit
    <compilation debug="true" targetFramework="4.5">
    <httpRuntime targetFramework="4.5" />

           <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" /></controls>

    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
    <add name="connectionString" connectionString="DELETED" />

asked on Stack Overflow Jun 19, 2015 by john doe

1 Answer


according to me there should be problem in your application pool.. Just change and select proper version 4.5 pool to solve your server problem.. If still not work for you then inform..

answered on Stack Overflow Jun 19, 2015 by Shirish

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