A Trusted Platform Module (TPM) is an example of a hardware-protected data store that can be used to protect cryptographic keys.
Check
Verify the web server is configured to provide protected storage for cryptographic keys with organization-defined safeguards and/or hardware protected key store.
If the web server is not configured to provide protected storage for cryptographic keys with organization-defined safeguards and/or hardware protected key store, this is a finding.
Fix
Configure the web server to provide protected storage for cryptographic keys with organization-defined safeguards and/or hardware protected key store.