SchUseStrongCrypto must be enabled.
An XCCDF Rule
Description
Exchange Server 2019 is configured by default with TLS 1.2. However, SchUseStrongCrypto is not set by default and must be configured to meet the TLS requirement. The strong cryptography (configured by the SchUseStrongCrypto registry value) uses more secure network protocols (TLS 1.2, TLS 1.1, and TLS 1.0) and blocks protocols that are not secure. SchUseStrongCrypto affects only client (outgoing) connections in the application.
- ID
- SV-259577r960759_rule
- Version
- EX19-ED-000006
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
In a PowerShell window with elevated privileges, run the following commands:
reg add HKLM\SOFTWARE\Microsoft\.NetFramework\v4.0.30319 /v "SchUseStrongCrypto" /t REG_DWORD /d 1
reg add HKLM\SOFTWARE\WoW6432Node\Microsoft\.NetFramework\v4.0.30319 /v "SchUseStrongCrypto" /t REG_DWORD /d 1
This will create the value within the necessary key and set the data to 1.