Hi ! Today my hosts (engine + all nodes) certificates expired and I re-run engine-setup to renew certificates. Then I did for each node host: Edit host -> Advanced parameters -> Fetch SSH public key (PEM) in order to update certificates on nodes, everything was finished just fine. Unfortunately, one of the most crucial nodes (node14) still shows this error: VDSM node14 command Get Host Capabilities failed: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed Restarted vdsms and vdsm-network, still same, node is marked as non-responsive, and all VM with "?" sign (unknown status). However, node14 pings without any problem, its storage domain shown in green (OK), and all VMs are running fine. Service vdsm-network status is OK, vdsmd is NOT: Aug 08 22:07:27 node14.***.lv vdsm[1264164]: ERROR ssl handshake: socket error, address: ::ffff:192.168.0.4 This node is running our accounting and stock control system, its storage domain holds VM disk of that software. If its nonoperational after restart, its a BIG trouble, I will not be able to migrate VM disk anywhere. Restoring accounting DB from daily backup is a lengthy process for 2 - 3 hours. Please advice what to do next. Thanks in advance.