Windows Server 2019 must be configured for named-based strong mappings for certificates.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-271429	SRG-OS-000080-GPOS-00048	WN19-DC-000401	SV-271429r1106520_rule	2025-05-23	3

Description
Weak mappings give rise to security vulnerabilities and demand hardening measures. Certificate names must be correctly mapped to the intended user account in Active Directory. A lack of strong name-based mappings allows certain weak certificate mappings, such as Issuer/Subject AltSecID and User Principal Names (UPN) mappings, to be treated as strong mappings.

ℹ️ Check
This applies to domain controllers. This is not applicable for member servers. Verify the effective setting in Local Group Policy Editor. Run "gpedit.msc". Or Using the registry, check HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters, Key: UseStrongNameMatches. Or Using GPRESULT, check the applicable GPO for "Allow name-based strong mappings for certificates". Navigate to Local Computer Policy >> Computer Configuration >> Administrative Template >> System >> KDC >> Allow name-based strong mappings for certificates. If "Allow name-based strong mappings for certificates" is not "Enabled", this is a finding.

ℹ️ Check

This applies to domain controllers. This is not applicable for member servers. Verify the effective setting in Local Group Policy Editor. Run "gpedit.msc". Or Using the registry, check HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters, Key: UseStrongNameMatches. Or Using GPRESULT, check the applicable GPO for "Allow name-based strong mappings for certificates". Navigate to Local Computer Policy >> Computer Configuration >> Administrative Template >> System >> KDC >> Allow name-based strong mappings for certificates. If "Allow name-based strong mappings for certificates" is not "Enabled", this is a finding.

✔️ Fix
Configure the policy value for Computer Configuration >> Administrative Template >> System >> KDC >> Allow name-based strong mappings for certificates to "Enabled".