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HTTP Error 500.19 - Internal Server Error - The requested page cannot be accessed because the related configuration data for the page is invalid [duplicate]

I have a simple MVC web api 2 IIS hosted application which I want to enable windows authentication (initially not using Owin). I am running this on my development machine and running as local IIS.
So, from what I could find, I need to add the following to the web.config
1: to the following section the authentication mode="Windows"
<system.web>
<compilation debug="true" targetFramework="4.5.1"/>
<httpRuntime targetFramework="4.5.1"/>
<authentication mode="Windows" />
</system.web>
2: Then add the following
<system.webServer>
<security>
<authentication>
<windowsAuthentication enabled="true"/>
</authentication>
</security>
When I add the above and run the application (in debug from Dev studio), I get the following error
HTTP Error 500.19 - Internal Server Error
Config Error This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".
and then it specifically points to this web config entry
Config Source:
37: <authentication>
38: <windowsAuthentication enabled="true"/>
39: </authentication>
Anyone have any ideas why I would be getting this?
Also, I noticed when I switch to IIS express, that in the project properties, the Windows Authentication is set to disabled, and grayed out so I cannot set it here either.
Thanks in advance for any help!

If you read applicationHost.config, you will see that authentication related sections are locked down and cannot be overridden in web.config,
<section name="windowsAuthentication" overrideModeDefault="Deny" />
Thus, you need to specify that in applicationHost.config, instead of web.config. Both IIS and IIS Express have such restriction.

How to deploy ASP.net website on somee.com?

I am trying to deploy sample website on somee.com using free hosting.
First I published my website as a folder. I already tested on my local machine on IIS 7 in my local machine. That is working fine without any problem.
1. I created new free hosting domain on somee.com, then in file manager ->
2. Then I make a zip folder for my published website folder
3. Then I upload the zip folder and select upload and unzip archives
4. Now this is my root folder file structure
5. I hope it will run the default.aspx file. Then I try to visit my site it throws error like below
Error msg
Server Error in '/' Application.
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS0016: Could not write to output file 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\b2d18bbc\3889fee\App_Web_home.master.cdcab7d2.cugbgmun.dll' -- 'Access is denied. '
Source Error:
[No relevant source lines]
Note
I created one small default.htm file for testing. If I upload that file. That's working fine.
Web.config file
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.web>
<customErrors mode="Off"/>
<compilation targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
</configuration>
If I add the default.aspx file as a start up page on web config like below,
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.webServer>
<defaultDocument>
<files>
<add value="Default.aspx" />
</files>
</defaultDocument>
</system.webServer>
<system.web>
<customErrors mode="Off"/>
<compilation targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
</configuration>
Error msg
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

Here are steps to publish your .net to the server:
Please open your project with Visual Studio tool
On the Solution Explorer windows (which is normally located on the top right hand corner of the VS tool), right click your project and select Publish
Please kindly publish it to a local folder, such as C:\Project
Please just upload whatever files/folders you see on C:\Project to the server via FTP and your site will work fine.
The steps will remain the same. If you face 500 internal server error, please ask somee to check full error message on the server.

In Web.confilg file turn on the customErrors
<system.web>
<customErrors mode="On">
</system.web>
now add connection string carefully .Only change provider connection value
<add name="DBModel" connectionString="metadata=res://*/Models.Model1.csdl|res://*/Models.Model1.ssdl|res://*/Models.Model1.msl;provider=System.Data.SqlClient;**provider connection string**='your database connection path'" providerName="System.Data.EntityClient" />

Configuration error after deploying ASP.NET application

I am using VS2012, A website on local machine works fine , when i deploy a website on remote PC / Server , it also works fine when you run on localhost in server computer, then problem arises when you access it remotely having static/live IP. it gives following configuration error.
deployed in following path
inetpub > wwwroot > PSE
I have also deployed a website in inetpub > wwwroot > POS which works fine
here is the website structure
Here is the only one web.config file in root directory
<?xml version="1.0"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<system.web>
<customErrors mode="Off"/>
<compilation debug="true" targetFramework="4.0">
<assemblies>
<add assembly="MySql.Data, Version=6.9.6.0, Culture=neutral, PublicKeyToken=C5687FC88969C44D"/>
</assemblies>
</compilation>
<httpRuntime targetFramework="4.0"/>
<authentication mode="Forms">
<forms defaultUrl="~/dao/pos.aspx" loginUrl="~/default.aspx" timeout="20" slidingExpiration="true"></forms>
</authentication>
</system.web>
</configuration>
Please guide me, where i am wrong and why i am getting above error.
here is IIS Configuration

Your error messages says that this is possibly caused by not configuring a virtual directory as an application. Have you checked this in IIS manager?
Look in the example below to see the difference between a application and a virtual directory that is not an application:
To convert a virtual directory to an application, right click and choose convert to application

An application error occurred on the server

I am trying to access a aspx page from an IIS server. The page contains a registration form. The browser is opening the page, but when I am trying to enter values into the field and want to save it, it displays this error:
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.
Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".
<!-- Web.Config Configuration File -->
<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>
Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.
<!-- Web.Config Configuration File -->
<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>
What is the problem, and how do i fix it?

It seems that while saving some error is occuring and you are not getting that exact error.
So you have two options add below code.
<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>
or Use try catch in your save function and in the catch block put code to write enitire exception as string in a text file and then in text file you will have exact error.
But I would suggest first option.

Displaying Error information in C# Asp.Net with the Web.config?

For some reason I can't see any useful information about my errors even though I Changed the customerrors section of the web.config:
<customErrors mode="RemoteOnly">
</customErrors>
All I want to do is be able to see the normal yellow screen of death that shows what is going wrong.
Ever since I tried to upload this site on my local developer PC's IIS, the application has not shown error information.
Whenever I start debugging the application fails immediatly and says, "Server Error in '/' Application." and gives me a 404 http error and only displays the Version of the .net framework and asp.net version.
*UPDATE:
I'm Running this locally on my development pc.

Set the Mode to Off instead of remote only. MSDN explains the different modes here:
http://msdn.microsoft.com/en-us/library/h0hfz6fc.aspx
If you are in RemoteOnly then it will only show the error if you are running it locally.

<configuration>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
<customErrors mode="" defaultRedirect=""></customErrors>
</system.web>
</configuration>
If you want to set your application level exception should redirect to your custom error page, you can do this by going to global.asax file and write the code for redirection in Application_Error method.
For handling all the exception, you just need to write the code for redirection at catch section. Also you can set custom error page for http errors by passing status code.
<customErrors mode="RemoteOnly" defaultRedirect="~/ErrorPages/Oops.aspx">
<error statusCode="404" redirect="~/ErrorPages/404.aspx" />
</customErrors>
follow this link:https://stackify.com/web-config-customerrors-asp-net/