About the WebBlocker Cache

To improve performance, WebBlocker stores recent URL lookups in a local cache on your Firebox or XTM device. WebBlocker stores to three levels of the URL path in the cache up. For example, if WebBlocker looks up the URL www.example.com/path1/path2/path3/path4/webpage.html, it stores only www.example.com/path1/path2/path3 in the cache.

In Fireware XTM v11.7 and higher, one WebBlocker cache is shared by all WebBlocker actions configured for the same categorization database type (Websense or SurfControl) on the device. The WebBlocker cache size varies by device model, and is not configurable.

WebBlocker Cache Size Device Model
8K Firebox T10, XTM 2 Series, 33, 330, 505, 510, 520, 530
32K XTM 515, 525, 535, 545, 810, 820, 830
64K XTM 1050
512K XTM 850, 860, 870, 1500, 2050, 2500

In Fireware XTM 11.6.x or lower, the size of the cache for each WebBlocker action is a number of entries based on the Cache Size configured in the Advanced settings for each WebBlocker profile. For more information, see Define Advanced WebBlocker Options.

Clear WebBlocker Cache

If you encounter problems with WebBlocker scanning and categorization of sites, you can clear the WebBlocker cache.

To clear the WebBlocker cache:

  1. Connect to Fireware XTM Web UI for your Firebox or XTM device.
  2. Select Dashboard > Subscription Services.
    The Subscription Services status page appears.
  3. In the WebBlocker section, click Clear cache.


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