> Source: [sk64280](https://support.checkpoint.com/results/sk/sk64280)

# sk64280 - How to clear URL Filtering kernel cache?

| Property | Value |
|----------|-------|
| Solution ID | sk64280 |
| Date Created | 2011-07-11 |
| Last Modified | 2026-02-07 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20, R81.10 (EOS), R81 (EOS) |

## Solution

**Follow these steps to clear the URL Filtering kernel cache on a Security Gateway / cluster:**

1. Connect with SmartDashboard/SmartConsole to the Security Management Server / Domain Management Server.   

2. Go to ***File*** menu - click on ***Database Revision Control...*** - create a revision snapshot. ***(This feature is not available in R80.XX+)***   

3. Close all SmartConsole windows (SmartDashboard, SmartView Tracker, SmartView Monitor, etc.).   

4. Connect with the [GuiDBedit Tool](http://supportcontent.checkpoint.com/solutions?id=sk13009) to the Security Management Server / Domain Management Server.   

5. In the upper left pane, go to ***Table*** - ***Other*** - ***rad_services*** .   

6. In the upper right pane, select ***urlf_rad_service_0***.
7. In the lower pane, right-click on the ***policy_install_cache_override*** - select ***Edit...*** - select "**`true`** " - click on ***OK***.

   *Example*:
   [![](https://sc1.checkpoint.com/sc/SolutionsStatics/sk64280/urlf_rad_service_0__clear_cache.png)](https://sc1.checkpoint.com/sc/SolutionsStatics/sk64280/urlf_rad_service_0__clear_cache.png "Click the image to see it in full size in a new tab/window")   

8. Save the changes: go to ***File*** menu - click on ***Save All*** .   

9. Close the GuiDBedit Tool.   

10. Connect with SmartDashboard/SmartConsole to the Security Management Server / Domain Management Server.   

11. Install the policy ***only*** on the involved Security Gateway / Cluster object.
12. Verify that the URL Filtering kernel cache table is empty on the involved Security Gateway / cluster members:

    Version R80.30 Gaia 3.10 and above: ***\[Expert@HostName\]# fw ctl multik print_bl urlf_cache_tbl -s*** Lower version Gaia 2.6.18:***\[Expert@HostName\]# fw tab -t urlf_cache_tbl -s***

    Output should be:

    ```
    HOST                  NAME                               ID #VALS #PEAK #SLINKS
    localhost             urlf_cache_tbl                    XXX     0     0       0
    ```

13. ***CRUCIAL STEP:*** Restore the default value for ***policy_install_cache_override*** ("false"):

    **Note:** If default value ("false") is not restored, then URL Filtering kernel cache will be cleared on each policy installation.
    1. Close all SmartConsole windows (SmartDashboard, SmartView Tracker, SmartView Monitor, etc.).   

    2. Connect with the [GuiDBedit Tool](http://supportcontent.checkpoint.com/solutions?id=sk13009) to the Security Management Server / Domain Management Server.   

    3. In the upper left pane, go to ***Table*** - ***Other*** - ***rad_services*** .   

    4. In the upper right pane, select ***urlf_rad_service_0*** .   

    5. In the lower pane, right-click on the ***policy_install_cache_override*** - select ***Edit...*** - select "**`false`** " - click on ***OK*** .   

    6. Save the changes: go to ***File*** menu - click on ***Save All*** .   

    7. Close the GuiDBedit Tool.
14. Connect with SmartDashboard/SmartConsole to the Security Management Server / Domain Management Server.   

15. Install the policy on the relevant Security Gateway / Cluster object.

**Related solutions:**

* [sk90422 - How to modify URL Filtering cache size?](http://supportcontent.checkpoint.com/solutions?id=sk90422)   

* [sk105179 - How to clear Anti-Virus kernel cache?](http://supportcontent.checkpoint.com/solutions?id=sk105179)

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