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Please run the following commands to check the state of the agent controller and the port states:

For Linux

ss -tulpn | grep 6556

ps waux | grep cmk-agent-ctl

cmk-agent-ctl status

systemctl status check-mk-agent.socket
systemctl status cmk-agent-ctl-daemon.service

For Windows

netsh interface ipv4 show excludedportrange protocol=tcp

Solution

For Linux

If the registration is good, but cmk-agent-ctl cannot be started. This might be a bug.

You might then switch to xinetd mode:

apt install xinetd

Disable the systemd services:

systemctl stop check-mk-agent.socket
systemctl disable check-mk-agent.socket
systemctl stop cmk-agent-ctl-daemon.service
systemctl disable cmk-agent-ctl-daemon.service

Install the xinetd service:

/var/lib/cmk-agent/scripts/super-server/1_xinetd/setup deploy
/var/lib/cmk-agent/scripts/super-server/1_xinetd/setup trigger

Disable TLS registration on the CMK Server: Properties of host → menu → entry Host → Remove TLS registration

Afterwards ss should show xinetd claiming the connection 

ss
systemctl status check-mk-agent.socket

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