Situation

# 允許除了FortiClient以外的防毒軟體運作
Allow other antivirus softwares included FortiClient.

Solution

[1]
Log in EMS Server WebUI > Endpoint Profiles > Malware Protection 

[2]
Click Real-Time Protection

[3]
If another AntiVirus product has already been installed 
> 
Always enable FortiClient Real-Time Protection