ssl_server_ca_chain and ssl_client_ca_chain are dead settings

The ssl_server_ca_chain setting is used in webrick to add intermediate root certificates (chain) to the SSL context. When the ssl server sends its Server Certificate message, it includes the chain of certs so that clients can validate the connection.

For example, :localcacerts might contain the cert for C=US/O=GeoTrust Inc./CN=GeoTrust Global CA

and :ssl_server_ca_chain might contain the cert for /C=US/O=GeoTrust Inc./CN=GeoTrust SSL CA - G2.