Policy non-compliance: Network Threat Protection : All is running


I don't understand, all my search show that some services can be down

In my case, all is green and running and this alert sent to me : Policy non-compliance: Network Threat Protection 
the available choices are :

  • Mark as acknowledge
  • Reinstall Endpoint protection

Few PC are impacted. At first i Reinstalled endpoint, and after some days the same alert comme back.
And now what can i do ?
I presume that is not safe


Thanks  for your opinion