SCOM 2012 SP1 - Setup SNMP monitoring = ping OK, no response SNMP.

Hello, 
I've tried the snmp monitoring in lab domain, everthing work. Now I work in the production environment, but I can't  make work the snmp. I've tried only snmp, but the same error occure. The Ping is ok, all my firewalls rules allows snmp and ping over
the domain. 
But when I launche the discovery, I've got an error after "No Response SNMP". I've analized the network with wireshark, I see the snmp get send to scom to the network device, but the netowrk device, reply " Destionation unreachable (Port unreachable)".
I've check with "netstat -ano -p udp" but I don't see the port 162, the 161 is open and snmp.exe service use it. But 162 is not open and Healthservice.exe doesn't use it.
I tried to reboot the server, but nothing change. And I check all my configuration, and it's the same in my lab domain and te production.
Anybody have the same issue? Or a workaround? 
Thank you in advance.
KimBaxZ

Hello Roger, 
1. Windows Firewall 
a. SNMP service authorized 
b. SNMP trap not authorized 
c. PING.exe authorized 
d. HealthService.exe authorized 
2. SNMP service configuration 
a. Security => Community name + Right OK
b. Security => Accept SNMP packets from any host
3. SNMP trap service disabled 
4. The network device (cisco switch is already configured and the snmp work well)
a. It's possible to execute a snmp walk on the switch, and we get all the data (we use a différents
computer to do this, like a linux server on the same network) 
5. We use snmp v2 on the switch, and during the discovery scom, send v2c snmp get to the switch with the good community name.
6. I tried to forge a snmp v2 packet and send them to the scom server, wireshark see the packet
During the discovery the switch get the snmp request, but he can't reply, the snmp trap port (162) on the scom server is not open. And I don't know why. 

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    Regards,
    Yan Li
    Regards, Yan Li

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