K3s cluster unreachable and SSH connection failed

Resolved

CCreateitvDEVELOPER4/8/2026

Unable to connect

Suggested action: Check if Zeabur System is running properly, or verify firewall and port settings

K3s cluster is unreachable.

Possible causes:

Resource usage may be at limit
Port 6443 may be blocked
K3s service may have stopped

Additionally, SSH connection to the server is also failing. Unable to access the machine for troubleshooting.

1 Reply

BCBohan ChenEMPLOYEE4/8/2026

Hi,

Your server is recovered. The issue was a missing container runtime binary in the k3s data directory, which caused every pod sandbox to fail and made the box wedge itself badly enough that even the in-OS shutdown command stopped responding (which is why your cpx31 → cpx41 plan upgrade also failed and rolled back).

We re-extracted the missing files from the k3s binary, restarted the service, and all system pods are now Running. K3s API and SSH are both reachable, the node is Ready, and your cluster state was preserved throughout. You can retry your plan upgrade and any deployments now.

If anything else looks off, just reply here.

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