Adapter - Broker connection thru a Firewall

Hello,

We have an XML adapter and a broker located at each side of a firewall.

The Enterprise Server security best practice precises that the connections are :
6847 Mutually authenticated (server to client and client to server) traffic between Adapters and the webMethods Enterprise Server, whether encrypted or not.

6848 Unidirectional (server to client) authenticated traffic between Adapters and the webMethods Enterprise Server, whether encrypted or not.

6849 Unauthenticated transmissions between Adapters and the webMethods Enterprise Server. All unauthenticated transmissions are also unencrypted.

6850 Monitoring the status of the webMethods Enterprise Server

6853 Adapter Monitor

My question is : Which is the correct parameter to set up in my firewall to ensure security and open only the right direction on each port for theses connexions.
I understand from the document :
6847 : both direction
6848 : server to client
6849 : both direction
6850 : both direction
6853 : both direction

is this correct ?

Thanx in advance.
Marc