ASP.NET: HTTP Error 500.19 – Internal Server Error

Question

I am replicating web application deployment and found several issues related to HTTP Error 500.19. My machine is running Windows 7 while the working development is using Windows 8. We're developing our Web Application using Visual Studio 2010.

First, I got error code 0x80070021, similar as posted here. I update my web.config according to the accepted answer and then I got following error code (which is similar as posted here).

HTTP Error 500.19 - Internal Server Error
Error Code 0x8007000d
Config Source -1: 0:

I have read the symptoms definition in Microsoft support page and cause of the error is:

This problem occurs because the ApplicationHost.config file or the Web.config file contains a malformed XML element.

and the solution is

Delete the malformed XML element from the ApplicationHost.config file or from the Web.config file.

However, the web.config that I used is working perfectly in the original development environment.

Here is what I have checked and tried so far:

1. Install ASP.NET by calling aspnet_regiis -i
2. Set my application to use different application pool (ASP.NET v4.0, .NET v4, etc)
3. ApplicationHost.config file is still using default from Windows 7.

This is part of my Web.Config

<system.webServer>
    <section name="handlers" overrideModeDefault="Allow" /> 
    <section name="modules" allowDefinition="MachineToApplication" overrideModeDefault="Allow" />
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true">
    </modules>
    <handlers>
        <remove name="UrlRoutingHandler" />
        <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
    </handlers>
    <urlCompression doStaticCompression="true" doDynamicCompression="false"></urlCompression>
    <directoryBrowse enabled="true" />
    <defaultDocument>
        <files>
            <add value="Logon.aspx" />
        </files>
    </defaultDocument>
</system.webServer>

I have read similar/duplicates/closed posts (around 13) posts in stackoverflow, tried all except the answer related to Ajax (is it related) and still have no clue on what the error is.

Does anyone one how to fix this error? (And if possible, a comprehensive lists of things need to be checked so we can reduce similar posts like this.) I am ready to provide more details.

Answer 1

For me, it was all about setting up my web server to use the latest-and-greatest tech to support my ASP.NET 5 application!

The following URL gave me all the tips I needed:

https://docs.asp.net/en/1.0.0-rc1/publishing/iis-with-msdeploy.html

Hope this helps :)

Answer 2

In my case, because I had reinstalled iis, I needed to register iis with dot net 4 using this command:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i

Answer 3

Problem solved. Here are the steps that I tried:

• Enable the 32-bit application in IIS -> Application pool -> Advanced settings
• Copy System.EnterpriseServices.dll and System.EnterpriseServices.Wrapper.dll from C:\Windows\Microsoft.NET\Framework\v2.0.50727 to the application bin folder
• Do comments/uncomments to sections on the web.config and found that problem related to the referenced DLL.

The config that I commented the previous one that I added:

<section name="handlers" overrideModeDefault="Allow" /> 
<section name="modules" allowDefinition="MachineToApplication" overrideModeDefault="Allow"/>

• Add the required FasterFlect.DLL used by Combres.DLL v2.1.0.0 to the application bin folder (shall download the full zip from Combres codeplex, because the required fasterflect DLL V2.0.3732.24338 cannot be found in fasterflect codeplex) and other DLLs. For convinience, use the full Combres.DLL (1,3MB)
• Check that the DLL versions and public key tokens are configured correctly in web.config using tool, e.g. .NET Reflector

Answer 4

I understand that this error can occur because of many different reasons. In my case it was because I uninstalled WSUS service from Server Roles and the whole IIS went down. After doing a bit of research I found that uninstalling WSUS removes a few dlls which are used to do http compression. Since those dlls were missing and the IIS was still looking for them I did a reset using the following command in CMD:

appcmd set config -section:system.webServer/httpCompression /-[name='xpress']

Bingo! The problem is sorted now. Dont forget to run it as an administrator. You might also need to do "iisreset" as well. Just in case.

Hope it helps others. Cheers