It does not look fixed to me in SAP help page.
If the simple case is - than it is fixed, BUT if it is a multitenant (like mine 
) - than things get complicated and less fixed.
Anyway - I have determined that agent can communicate on both ports (30013 and 30015) with the DB as both ports are open and can be accessed via management tool, using user, dedicated for monitoring purposes and defined in the agent.
Now I do not have any alarm BUT:
- there is no additional data from HANA, to be seen
- there is no evidence in the DB that this user has ever logged in
What do I miss?
This is THE situation known as “all is well but does not work”.