Unable to login to Sitefinity after installing Windows Update

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Article Number000082760
EnvironmentProduct: Sitefinity
Version: 10.x
OS: Windows 10, Windows Server 2016
Database: All supported Microsoft SQL Server versions
Question/Problem Description
Users are unable to login to Sitefinity.

Error when not able to log in
Steps to Reproduce
Clarifying Information
Enable the authentication logging to see the actual error in the ~/App_Data/Sitefinity/Logs/Authentication.log file.

1. Open the ~/App_Data/Sitefinity/Configuration/AuthenticationConfig.config file
2. Find the <identityServerSettings> element under the <securityTokenServiceSettings> element
3. Add the following attribute to the <identityServerSettings> element

4. Restart the application
Error Message1. Unexpected error.

2. System.Security.Cryptography.CryptographicException: Invalid algorithm specified.
Defect/Enhancement Number
One of the following Windows Updates has been installed on the server:

KB4025342, July 11, 2017—KB4025342 (OS Build 15063.483)
KB4025339, July 11, 2017—KB4025339 (OS Build 14393.1480)
KB4025344, July 11, 2017—KB4025344 (OS Build 10586.1007)
1. Download and install .NET Framework 4.6.2 from Microsoft Download Center, Microsoft .NET Framework 4.6.2 (Offline Installer) for Windows 7 SP1, Windows 8.1, Windows Server 2008 R2 SP1, Windows Server 2012 and Windows Server 2012 R2

2. For production environments use a custom certificate for IdentityServer signing by following the steps in Sitefinity Documentation, Authentication flow and certificates
Switch to Claims authentication.

1. Open the ~/App_Data/Sitefinity/Configuration/AuthenticationConfig.config file
2. Add the following attribute to the <authenticationConfig> element

3. Restart the application
Last Modified Date2/1/2018 4:41 PM

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