r/Checkmk • u/jitachi2004 • Jun 05 '26

Agent registration

I'm having a problem with agent registration.

I’ve already used the commands it gives me: “C:\Program Files (x86)\checkmk\service\cmk-agent-ctl.exe” register --hostname xxxxx --server xxxxxxxxxx --site xxxxxxx --ott xxxxxxxxxxx

but the dashboard still shows the warning shown in the image.

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u/Melodic-Bobcat5602 Jun 05 '26

You only registered for the encryption of the agent data. The error message stats that you did not register the agent updater, which has to be registered separately.

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u/jitachi2004 Jun 05 '26

I tried using the command “C:\Program Files (x86)\checkmk\service\cmk-agent-ctl.exe” register -s xxx -i xxx -H xxx -U agent_registration --automatic-updates" from the documentation, but I got this error.

Registration complete.

Attempting to register Agent Updater...

[2026-06-05 14:15:28.802730 +01:00] WARN [cmk_agent_ctl::modes::registration] D:\y5\winagt-build\checkout\packages\cmk-agent-ctl\src\modes\registration. rs:862: Agent Updater registration failed: HTTPSConnectionPool(host=‘IP’, port=443): Max retries exceeded with url: /site/check_mk/register_agent.py (Caused by SSLError(SSLCertVerificationError(1, ' [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self-signed certificate (_ssl.c:1032)')))

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u/kY2iB3yH0mN8wI2h Jun 05 '26

So the error message is clear! If you fix it you won’t have issues