https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.2/html/configuration_guide/domain_management#configure_domain_controller

Section 8.3.2 says:
<native-interface security-realm="ManagementRealm">
<socket interface="management" port="${jboss.management.native.port:9999}"/>
</native-interface>

which has been removed in EAP 7.0 and later.

It also says:
The EAP_HOME/domain/configuration/host-master.xml file is already preconfigured with these settings to act as the domain controller.

So that's incorrect also.

However, there are use-cases where customers might want to add back the native-interface, so may want to have instructions for this in this kcs:
https://access.redhat.com/solutions/3828811

Section 8.3.3 makes a similar error with native-interface/port 9999 with the host-slave.xml.

I haven't checked other docs for similar errors with native-interface and port 9999.