Plug-in exception in MKDockerClient.__init__: Error while fetching server API version: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))

Troubleshooting
,
1

CMK version: 2.4.0p8.cee
OS version: Ubuntu 24.04.3 LTS

Error message: Plug-in exception in MKDockerClient._init_: Error while fetching server API version: (‘Connection aborted.’, ConnectionRefusedError(111, ‘Connection refused’))

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)

APT Updates          No updates pending for installation
CPU load             15 min load: 0.83, 15 min load per core: 0.41 (2 cores)
CPU utilization      Total CPU: 18.18%
Check_MK Agent       Version: 2.4.0p8, OS: linux, TLS is not activated on monitored host (see details), Agent plug-ins: 3, Local checks: 0
Disk IO SUMMARY      Read: 8.19 kB/s, Write: 62.4 kB/s, Latency: 1 millisecond
Docker containers    PEND Container statistics missing
Docker node info     Plug-in exception in MKDockerClient.__init__: Error while fetching server API version: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))

All other checks are working perfectly and reporting filesystem ressources used by docker…

Any suggestion?

Thank you all.

2

Check the Agent Output on the System for any additional Information.

Check docker (api) for additional access restriction / permissons / firewall / routing issue.

1 Like
3

Thank you for your time and effort in giving me those suggestion.
I will try to get some more insight on the agent output.
As for the docker environment - I have installed it on test machine just to have something to monitor, while setting up K8s and docker monitoring. No special settings/restrictions. Also am quite positive that it worked from the beginning and I have noticed this change only recently… :thinking: