High-Risk Intrusion Detected, Attack: an intrusion attempt was blocked.

Every other day I get 2 emails from my Symantec Cloud alerts.  I can not find any reference to these and have no idea what is causing the attack.  How can I fix this and find what is trying to connect?

A high-risk intrusion was detected on (Servername)

Server Group on 10/21/2014 4:16:52 PM.

Intrusion Name
Attack: an intrusion attempt was blocked.

Targeted Application

Targeted IP
192.168.1.200

Targeted Port Number
0

Targeted Host Name

Status
Blocked