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In that case, the agent controller is not running because xinetd is running. For the agent controller, systemd is necessary: https://checkmk.com/werk/13865 Werk #13865: Agent controller on Unix: Deny registration if agent socket is not operational
If you're using the bakery, you need to create the following rule:
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Without the bakery, please follow these steps: https://docs.checkmk.com/latest/en/agent_linux_legacy.html#_systemdAgent Linux Legacy
ERROR [cmk_agent_ctl] Failed to discover agent receiver port from Checkmk REST API, both with http and https.
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Add the self-signed certificate to the OS's cert store. Example for Ubuntu: https://ubuntu.com/server/docs/security-trust-Install a root CA certificate in the trust store
ERROR [cmk_agent_ctl] Error while loading registered connections.
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If you see this error message, when trying to register the agent controller, there is probably something wrong with the user.
Possible solutions
- It is obvious, but it needs to be said: Check whether the username and the password or the secret are correct.
- This error message can also be displayed when the option disable the login to this account is activated for this user. So please go to Setup > Users > Users in Checkmk and check if you see the following icon in the row for the user you are trying to authenticate with:
In this case, you have to edit the user and deactivate the checkbox in front of disable the login to this account.
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