In Application Server Enterprise Edition 7.1, the auth-passthrough plugin function could be configured on the proxied Application Server instance in order to make the remote client's information directly available to any applications deployed on it; as if the proxied Application Server instance had received the request directly, instead of via an intermediate web server running the service-passthrough plugin.
In Enterprise Server 2.1, the auth-passthrough feature may be enabled by setting the authPassthroughEnabled property of the <http-service> element in domain.xml to TRUE, as follows:
<property name="authPassthroughEnabled" value="true"/>
The same security considerations of the auth-passthrough plugin function in Application Server Enterprise Edition 7.1 also apply to the authPassthroughEnabled property in Enterprise Server 2.1. Since authPassthroughEnabled makes it possible to override information that may be used for authentication purposes (such as the IP address from which the request originated, or the SSL client certificate), it is essential that only trusted clients or servers be allowed to connect to an Enterprise Server 2.1 instance with authPassthroughEnabled set to TRUE. As a precautionary measure, it is recommended that only servers behind the corporate firewall should be configured with authPassthroughEnabled set to TRUE. A server that is accessible through the Internet must never be configured with authPassthroughEnabled set to TRUE.
Notice that in the scenario where a proxy web server has been configured with the service-passthrough plugin and forwards requests to an Enterprise Server instance with authPassthroughEnabled set to TRUE, SSL client authentication may be enabled on the web server proxy, and disabled on the proxied Enterprise Server instance. In this case, the proxied Enterprise Server instance will still treat the request as though it was authenticated via SSL, and provide the client's SSL certificate to any deployed applications requesting it.