Port 5800 or 5900 must be open for VNC access to nodes.
See Also
CC-SG Communication Channels
CC-SG and Raritan Devices
CC-SG Clustering
Access to Infrastructure Services
PC Clients to CC-SG
PC Clients to Nodes
CC-SG and Client for IPMI, iLO/RILOE, DRAC, RSA
CC-SG and SNMP
CC-SG Internal Ports
CC-SG Access via NAT-enabled Firewall
RDP Access to Nodes
SSH Access to Nodes
Remote System Monitoring Port