Procedure

1. Create or modify an Other (not an Antivirus) policy.
   • For information on creating a new rule, see Adding Policies.
   • For information on modifying an existing rule, see Modifying Existing Policies.
2. Under Web Reputation on the Scanning Conditions screen, select Web Reputation settings.
3. Click Web Reputation Settings.
   The Web Reputation Settings screen appears.
4. Select one of the following security levels.
   • High: Blocks more websites embedded in messages but also increases the risk of false positives. Select High if your users are visiting too many malicious websites.
   • Medium: Blocks an average number of malicious websites. Medium is the default setting because it blocks most web threats while keeping the false positive count low.
   • Low: Blocks fewer websites embedded in messages and reduces the risk of false positives. Select Low if IMSS is blocking too many legitimate websites.
5. Select Enable the use of the Web Reputation Approved List to prevent IMSS from scanning and blocking domains included in the Web Reputation Approved List.
6. Optional: Select Detect URLs that have not been tested by Trend Micro to increase protection against short-lived websites.

   Note Web pages change frequently, and it is difficult to find data or follow a link after the underlying page is modified. Such websites are usually used as vehicles for transporting malware and carrying out phishing attacks.

7. Click Save.