Fortigate and McAfee ssl deep inspection

Hello!

We have FortiGate and McAfee with SSL inspection on both devices, and it works only when SSL inspection enabled either on FortiGate or McAfee. FortiGate and McAfee use the same certificate. Do anyone have some best practice regarding this question?

LAN-FORTIGATE-MCAFEE-INTERNET

Thanks,

Anatoliy Kim