IIS V10.0 in Windows 10 does not recognise anymore customErrors on web.config with 500.19 0x80070032 error


I use IIS 10 on windows 10, I was use to have web.config files with customErrors, but now it is not accepting it anymore. I been procrastinating hotfixing just removing the line from the webconfig, but now I am trying to figure out what is wrong and fix it once and for all.

Error shown:

Error Source:

   <customErrors mode="Off"/>
   <httpRuntime targetFramework="4.6.2" />

The machine config has <deployment retail="true" />, and whit this configuration if I remove the tag IIS works fine and the web application is served correctly, if I change the retail setting to false, it will break again asking for the customErrors to be set.

I could not find any information online on this specific type of issue, and I tried to follow also the error code investigation path, but it leads to TLS configuration which in my case is correct and enabled.

asked on Stack Overflow Sep 15, 2020 by Norcino

1 Answer


After lots of digging I found that one of the machine.config (for the current framework4x and architecture x64) had a missing section in the system.web group:

 <sectionGroup name="system.web" type="System.Web.Configuration.SystemWebSectionGroup, System.Web, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
      <section name="customErrors" type="System.Web.Configuration.CustomErrorsSection, System.Web, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

I copied the section from the 32 bit version of the machine.config and this fixed the issue. This documentation about IIS configuration hierarchy helped me: https://docs.microsoft.com/en-us/iis/get-started/planning-your-iis-architecture/the-configuration-system-in-iis-7#:~:text=%20At%20the%20root%20%28or%20global%29%20level%2C%20there,global%20defaults%20for%20the%20.NET%20framework...%20More%20

answered on Stack Overflow Sep 15, 2020 by Norcino

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