Thats an IPS notification... its normally for a reason, particularly now we have our new more granular IPS engine in SEP.
Have you confirmed that the IP address in question is clean by running a scan against the machine, or is it a machine not on your network?
If you want to disable this notification, you can do it on the management server console:
Click Clients, Expand Location Specific Settings, Click Client User Interface Control Settings, Click Customize, choose your options in Intrusion Prevention Notifications