ca\_path | String | **Deprecated.** Path to the CA certificate file.
ticket\_salt | String | **Optional.** Private key for [CSR auto-signing](06-distributed-monitoring.md#distributed-monitoring-setup-csr-auto-signing). **Required** for a signing master instance.
crl\_path | String | **Optional.** Path to the CRL file.
- bind\_host | String | **Optional.** The IP address the api listener should be bound to. Defaults to `0.0.0.0`.
+ bind\_host | String | **Optional.** The IP address the api listener should be bound to. If not specified, the ApiListener is bound to `::` and listens for both IPv4 and IPv6 connections.
bind\_port | Number | **Optional.** The port the api listener should be bound to. Defaults to `5665`.
accept\_config | Boolean | **Optional.** Accept zone configuration. Defaults to `false`.
accept\_commands | Boolean | **Optional.** Accept remote commands. Defaults to `false`.