CMK version: Checkmk Raw Edition 2.4.0p15
OS version: Ubuntu 24.04 (WSL2 for Windows 11)
Error message: Refused: A TLS connection is registered on the monitoring server but the agent is not providing it
I was trying out Checkmk for the first time and was following along the beginner’s guide. I am running Checkmk inside a docker container running in WSL Ubuntu 24.04.
I then installed the cmk agent directly inside the WSL and performed the registration. The output was the following:
Connection: localhost/cmk
UUID: 83f9aa73-0b5b-4052-9906-f49f71ec8ab3
Local:
Connection mode: pull-agent
Connecting to receiver port: 8000
Certificate issuer: Site ‘cmk’ agent signing CA
Certificate validity: Wed, 12 Nov 2025 13:09:53 +0000 - Tue, 12 Nov 2030 13:09:53 +0000
Remote:
Connection mode: pull-agent
Hostname: localhost
When I run the connection test for the host inside the checkmk interface I get a successful ping and traceroute but in the agent logs the error is the following: Refused: A TLS connection is registered on the monitoring server but the agent is not providing it.
If I run checkmk directly inside the docker container everything works fine. Am I misinterpreting the setup steps? I think that checkmk is trying to communicate with an agent inside its docker container when connecting to the host “localhost”. Is there a way for it connect to the agent in the WSL?