To allow the sFlowTrend-Pro server to receive sFlow from the devices that you are monitoring, the incoming sFlow data must be allowed to pass through any firewalls. When using a host firewall with a service, the firewall configuration can be confusing, since the configuration must correspond to the user that the service is running as. See Section 14.2.4, “What firewall requirements does sFlowTrend-Pro have?” if you are having difficulty in receiving sFlow.