For TLS-based EAP types, such as TLS, TTLS and PEAP, this
                  parameter specifies the name of a file containing the RADIUS server
                  certificate. The server certificate is sent to the EAP client and
                  validated by the client during EAP authentication. The certificate file
                  may be in PEM or ASN1 format, depending on the setting of the
                  EAPTLS_CertificateType parameter. The certificate
                  file can also contain the server's TLS private key if the
                  EAPTLS_PrivateKeyFile parameter specifies the same
                  file. If the server certificate is a chain of certificates, use
                  EAPTLS_CertificateChainFile instead.
               Special
                  characters are supported.
               
                  Important
                  
                     System certificate
                        store is not used. The TLS configuration parameters must cover all CAs,
                        CRLs and other settings that are needed.