Answer

Alwil Avast! for Kerio works with WinRoute Firewall on Windows NT/2000/XP/2003.

To install:

1. Download avast! for Kerio.
2. Install avast! for Kerio. If you have any trouble with the installation, you can contact Alwil for free technical support.
3. Open the Kerio Administration Console and connect to Kerio WinRoute Firewall.
4. Go to Configuration->Content Filtering->Antivirus. Select the "Antivirus" tab.
5. Click on "Select antivirus..." (near the top).
6. Choose "Alwil avast! 4.0 for Kerio"
7. Click "Check & OK." After a second, you should get a message saying "Antivirus started."
8. Click "Test antivirus." You should get a message saying "Antivirus is working properly. Antivirus test successful."

avast! should now be working properly and scanning your firewall traffic!