Question:  is port 28001 really needed for replication?

It seems previous versions of Avamar didn't need port 28001 opened for replication..

7.1.x seems to require it....  Yet replication jobs complete with a blue checkmark!

Logs ::--->

So if it is needed...  And it's not there...  why the blue checkmark?  And what does port 28001 do for replication?

Thanks

Joe Despres