When authentication-configuration in Elytron subsystem uses attribute protocol then value of this attribute is not used for outgoing connection. Attributes host and port are used correctly.

Following authentication-configuration of Elytron subsystem should use URL remote+http://localhost:9990 for outgoing connection, but protocol remote+http from protocol is not used:

<authentication-configuration name="authConfig" authentication-name="admin" protocol="remote+http" host="localhost" port="9990">
    <credential-reference clear-text="pass@123"/>
</authentication-configuration>