The Manager API is enabled by default, but only listens to localhost
connections on port 8090.
The Manager REST API can be disabled with the tpm flag:
manager-rest-api=false
If required, the listen port can be changed using the tpm option:
manager-rest-api-port=8090
Exposing the API to a different network address for remote access, like an internal network, consists in changing the listen address of the API server.
For example, granting access to local 192.168.1.* network would translate to the tpm option:
manager-rest-api-address=192.168.1.0
Note that exposing the API to a public network can introduce a security breach like brute-force or DDoS attack exposure
The Manager specific Developer Docs can be viewed here