WG342 A22 - Public web servers must use TLS if authentication is required.
Transport Layer Security (TLS) is optional for a public web server. However, if authentication is being performed, then the use of the TLS protocol is required. Without the use of TLS, the authentication data would be transmitted unencrypted and would become vulnerable to disclosure. Using TLS along with DoD PKI certificates for encryption of the authentication data protects the information from being accessed by all parties on the network. To further protect the authentication data, the web server must use a FIPS 140-2 approved TLS version and all non-FIPS-approved SSL versions must be disabled. FIPS 140-2 approved TLS versions include TLS V1.0 or greater. NIST SP 800-52 specifies the preferred configurations for government systems.
Edit the httpd.conf file and set the SSLProtocol to 'TLSv1' for Apache 2.2.22 and older or to 'ALL -SSLv2 -SSLv3' for Apache versions newer than 2.2.22. The SSLEngine parameter must also be set to On.