1.The network manager receive the trap port is 161, please check the port on IAD is the same or not. The default port is 162, check as following: no need to do handshake
2.Please check the current trap bind the device information. In “trap receiver ”web page, click “bind device”，check the device list there is this IAD or not, the capture is as following：
confirm that the IAD device is list in “bind device”.
3.Open the wireshark, make data capture on the EMS, at the same time, revise the IAD register nm sip(IAD send snmp message to EMS). As the picture below, “advanced settings-UCEMS settings—main UCEMS ip address”
First revise the ip as the wrong ip （18.104.22.168）,save,then open the page again, revise the ip as the right ip as before.（should be 10.255.3.30）,save. ---so that the IAD can register to EMS with SNMP message again.
4.send to package to RD, check out that the port162 is not open on firewall, then open 162, test ok.