Knowledge Base FAQ Item #7250005

Q7250005: What ports do I need to open in the firewall to enable communication between the ActiveXperts Network Monitor server and the monitored Windows servers? We're using WMI through DCOM.

WMI through DCOM uses TCP ports 135 and 445, as well as dynamically-assigned ports above 1024.

If you monitor Windows machines through a firewall, it is recommended to use WMI over WinRM, because that uses only one port (default: 5986 for secure HTTPs access, or 5985 for non-secure HTTP access).