I did not see a response so I will pose the question separately.
There is an issue with the grammar of the question or the explanation of the failure.
“2. Block incoming port 6000 on all apps for everyone except for LBR host.”
This says only accept request from LBR host.
Which is what I did.
Attempts access the app server from any other host through port 6000 failed, only request from LBR was successful.
Can you help me and other understand the question/response better?