You want to know how to block specific files types from user access in Symantec Web Security Service (WSS).

To block a file type

1. Log in to the WSS portal.
2. Navigate to Solutions > Content Filtering > Policy > Add Rule.
3. Follow the wizard. You can accept the default for all attempts or apply stricter conditions.
   • Specify the Who; (source)
   • Specify From Where; (location).
   • Specify To Where; (destination).
   • Specify What; (action/user agent).
   • Specify When; (time applies).
4. On the Limits page, specify the file type to block.
5. On the Verdict page, determine what happens upon a block.
6. After creating each rule, click Activate. The policy is activated.