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After installing the agent, the registration is not working and showing the following issue:

Solution

Please check and verify that the agent controller is running:

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

In that case here, the agent controller is not running because xinetd is running. For the agent controller, systemd is necessary: https://checkmk.com/werk/13865

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