2.1.0p2: agent is not registered

Also another issue, the agent installed on the server to monitor itself is not working anymore:

even if I telnet 127.0.0.1 6556 I get the agent output. Here I cannot remove xinetd, because if I try it says it will remove check-mk-raw-2.1.0p2 and all the dependencies as well.

Here is the connection test: