Kerio Control Offline License File |verified| May 2026

To register Kerio Control using an offline license file (typically a

Browse for your downloaded license.key file and follow the remaining prompts to finish.  Troubleshooting Common Issues  Registering new Kerio Control Box Kerio Control Offline License File

Click Register product (or "Update license info" if already partially set up). To register Kerio Control using an offline license

• Warning: The appliance will not know the license has been renewed until a new license file is uploaded.

What it is (brief)

The Offline License File is a downloadable license token you apply directly to a Kerio Control appliance when the device can’t reach the vendor’s licensing servers. It replaces online activation and keeps security services running without exposing the appliance to external connectivity just for license validation. Warning: The appliance will not know the license

The "Time Bomb" Issue

Kerio Control uses system time to validate the license. If your offline server's CMOS battery dies and the date resets to 2010, the firewall will think the valid license is expired. Always sync your offline server’s clock via NTP (even if just to an internal stratum server) before importing the license.