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Local site suddenly stopped working after running the Windows 10 Updates

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TitleLocal site suddenly stopped working after running the Windows 10 Updates
URL Namelocal-site-suddenly-stopped-working-after-running-the-windows-10-updates
Article Number000187659
EnvironmentProduct: Sitefinity
Versions: 5.x, 6.x, 7.x, 8.x, 9.x, 10.x
OS: All supported OS versions
Database: All supported Microsoft SQL Server versions
Question/Problem Description
The environment consists on an upgraded Windows 10 machine performs automatic updates. After a big round of updates installed, the local Sitefinity site no longer works and throws an exception on startup: The type initializer for 'Telerik.Sitefinity.Security.SecurityManager' threw an exception.
Steps to Reproduce
Clarifying Information
Error MessageThe type initializer for 'Telerik.Sitefinity.Security.SecurityManager' threw an exception.
Defect Number
Enhancement Number
If this behavior has occurred after recently applying a Windows update (e.g. Windows 10 Creators) it might be due to the .NET 4.7 updates of certain Microsoft assemblies, thus we advise applying  the respective patch specified below.

Fixed in:

Sitefinity 10.0 Hotfix3 (Build 10.0.6411.0)
Sitefinity 9.2 Hotfix3   (Build 9.2.6230.0)
Sitefinity 9.1 Hotfix3   (Build 9.1.6150.0)
Sitefinity 9.0 Hotfix3   (Build 9.0.6030.0)
Sitefinity 8.2 Hotfix2   (Build 8.2.5940.0)
Sitefinity 8.1 Hotfix3   (Build 8.1.5830.0)
Sitefinity 8.0 Hotfix3   (Build 8.0.5750.0)
Sitefinity 7.3 Hotfix4   (Build 7.3.5670.0)
Sitefinity 7.2 Hotfix3   (Build 7.2.5330.0)
Sitefinity 7.1 Hotfix1   (Build 7.1.5220.0)
Sitefinity 7.0 Hotfix1   (Build 7.0.5120.0)

Sitefinity Internal Build 10.0.6421.0
Sitefinity Internal Build 9.2.6231.0
Sitefinity Internal Build 9.1.6151.0
Sitefinity Internal Build 9.0.6031.0
Sitefinity Internal Build 8.2.5941.0
Sitefinity Internal Build 8.1.5831.0
Sitefinity Internal Build 8.0.5751.0
Sitefinity Internal Build 7.3.5671.0
Sitefinity Internal Build 7.2.5331.0
Sitefinity Internal Build 7.1.5221.0
Sitefinity Internal Build 7.0.5121.0

Refer to Knowledge Base Article How to update Sitefinity to hotfix, internal build or a patch for instructions on how to download and install the fix.
Uninstall .NET 4.7 by removing the specific Windows Update. Refer to .NET Blog, Microsoft .NET Framework 4.7 is available on Windows Update, WSUS, and MU Catalog for specific update numbers.
Related articles:
Progress Article 000081734, Sitefinity and .NET 4.7 compatibility issues
Progress Article Difference between HotFix and Internal Build

To validate if the server has the Microsoft .NET Framework 4.7 update run the following command in the command prompt:

reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\full"

4.7 update
Last Modified Date11/20/2020 7:14 AM
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