ipcc_send_rec failed: Connection refused

This morning one of the node running all VMs was kicked out of the cluster. A reboot seems to be fixed whatever the issue was. Going back in the log there are many dozen lines with this error msg:

Quote:

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pveproxy[299993]: WARNING: ipcc_send_rec failed: Connection refused

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Several lines of this msg:
While trying to SSH before the reboot, i could access the server and goto /etc. But if i tried to goto /etc/pve it gave me Connection time out error. Any idea what might have caused this or how can i trace the root cause of the issue?

No backup was scheduled when the problem happened.