OppManager is not detecting CPU, Memory Utilization for some network devices while it detect all details regarding Ethernet ports for the same device

OppManager is not detecting CPU, Memory Utilization for some network devices while it detect all details regarding Ethernet ports for the same device

Dears,
 
This is my first implementation for OppManager and I am kindly need your assistance.
 
The customer have 3come switches and Fortigate firewall, my problem is that Oppmanger is not providing CPU, Memory utilization, etc.. while providing all details regarding their Ethernet ports for the same devices.
 
Please find attached the snapshot and advice.
 
Error for the below devices:
 
FortiGate firewall 500a
3COM Switch 7758 core switch
 
 

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