Follow the steps below to add a custom Security Risk Exception:
Launch the Symantec Endpoint Protection Manager.
Create a blank Centralized Exceptions policy.
Under the Policies view, select the Centralized Exceptions option, then click Add a Centralized Exceptions Policy.
Enter a name for the policy and then click OK.
Click the Monitors view.
Under the Logs tab, change the Log Type to Risk.
Click the View Log button to open the Risk Logs page.
Select the risk you want to exclude.
From the Action drop-down list, select Add Risk to Centralized Exceptions Policy, then click Start.
Select the blank policy you created, and click OK.
http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2008100706493648