If your CSN is unable to show the CAStor nodes via the Web console, then avahi-daemon is most likely not running.
Please check with "service avahi-daemon status" , if the daemon is not running there can be 2 reasons:
1 - the messagebus service is not running , Resolution: type "service messagebus start"
2- you ran out of space in /var , Resolution: please make sure /var/log is running in its own partition, specially if you increased Swarm log levels, free up space and you should then be able to start avahi-daemon
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