thanks, unfortunately I already removed xinetd time ago, replaced with systemd first and now I’m trying with the new agent… I correctly have cmk-agent-ctl listening on 6556:
# ss -tulpn | grep 6556
tcp LISTEN 0 128 *:6556 *:* users:(("cmk-agent-ctl",pid=30716,fd=9))
if I telnet from the server to the host on port 6556 I get only 16 as an answer:
$ telnet **** 6556
Trying ****::...
Connected to ****.
Escape character is '^]'.
16
Which means the connection is ok, there are no firewalls blocking it