By default, syslog messages are exporter form the devices to port 514, while NetVizura listens on the port 33514. You need to (1) redirect syslog messages to the 33514, or (2) export syslog messages to 33514, or (3) change NetVizura EventLog configuration.
To change NetVizura EventLog configuration go to Settings > EventLog Settings > Configuration and under Service options change the Syslog socket port value.