An RCA would be difficult to know after the reboot. It is mostly the DCRServer processes, or OGS services might be down, which may have caused the devices not to show up.
You can check NMSROOT/log/dcrserver.log and OGSServer and client.log and syslog.log may show if the processes went down.
You can also check the event viewer if it has any LMS related tasks.
Next time if it happens, it will be easier to run command - pdshow from server command prompt or /opt/CSCOpx/bin/pdshow from server console (Sol) to check if any processes are down in LMS, where we can know the affected services.
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