Help with iStat and firewalls
If you’re having difficulty getting iStat to connect to iStat Server, there’s a chance the connection is being blocked by a firewall.
If you’re using the in-built firewall in macOS, go to System Preferences → Security → Privacy → Firewall and allow /Library/Application Support/iStat Server/iStatServer.
For all other firewalls #
Please refer to the specific help documentation that came with your hardware or software.