APM - Best Practices
On Windows servers where the firewall is turned on, it may happen that the WMI protocol is blocked, causing the monitored Windows services to return an Unknown state.
To avoid this situation, it is recommended that if you have a firewall running on your Windows servers that you verify that the following elements are respected. It is possible to use a GPO to push these firewall rules.
|Local Port||135, 139, 445, 49154|