Windows Server 2019 must be configured to use FIPS-compliant algorithms for encryption, hashing, and signing.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-205842	SRG-OS-000478-GPOS-00223	WN19-SO-000360	SV-205842r1028367_rule	2025-02-25	3

Description
This setting ensures the system uses algorithms that are FIPS-compliant for encryption, hashing, and signing. FIPS-compliant algorithms meet specific standards established by the U.S. Government and must be the algorithms used for all OS encryption functions.

ℹ️ Check
This is NA if the host is running SharePoint. If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Control\Lsa\FIPSAlgorithmPolicy\ Value Name: Enabled Value Type: REG_DWORD Value: 0x00000001 (1) Clients with this setting enabled will not be able to communicate via digitally encrypted or signed protocols with servers that do not support these algorithms. Both the browser and web server must be configured to use TLS; otherwise. the browser will not be able to connect to a secure site. If the server is hosting SharePoint, this is not applicable.

ℹ️ Check

This is NA if the host is running SharePoint. If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Control\Lsa\FIPSAlgorithmPolicy\ Value Name: Enabled Value Type: REG_DWORD Value: 0x00000001 (1) Clients with this setting enabled will not be able to communicate via digitally encrypted or signed protocols with servers that do not support these algorithms. Both the browser and web server must be configured to use TLS; otherwise. the browser will not be able to connect to a secure site. If the server is hosting SharePoint, this is not applicable.

✔️ Fix
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing" to "Enabled".