Monitoring a firewalled server (which ports to open)
We'd like to monitor a Linux server that is running a basic software firewall (apf). As soon as we turn the firewall on OpManager is no longer able to capture CPU and Memory usage stats for that server. We have port 161 TCP/UDP open for both incoming and outgoing traffic on the firewalled server. Are there any other ports we need to open so OpManager can collect CPU and Memory utilization stats?