If your primary internet line fails and you are operating on a 4G backup with strict data caps, you might not want the firewall consuming data for license checks. You can switch to an offline license temporarily.
The Kerio Control Offline License File is a practical, no-nonsense feature that addresses a real-world gap for administrators who can’t — or won’t — rely on online activation. It’s not flashy, but it’s exactly the sort of dependable tool that network teams quietly appreciate: simple to use, security-conscious, and effective at keeping defenses up when connectivity won’t cooperate.
An offline license file for Kerio Control is a .key file that allows you to activate the firewall software without requiring the instance to have a direct internet connection. This is essential for secure, air-gapped environments or deployments with restricted external access where the standard automatic online registration cannot reach GFI’s servers. Phase 1: Acquiring the License Key File
To use the offline method, you must first generate and download the license file from a machine that does have internet access.
Visit the Registration Page: Navigate to the GFI/Kerio Product Registration page.
Provide Credentials: Enter your purchased Server License Number and the required captcha code.
Verify Info: Confirm that the displayed license information matches your purchase. You may need to provide your company details and agree to the Privacy Policy.
Hardware Identification: For hardware appliances (Kerio Control Box), you might be asked for the hardware Serial Number.
Download: Once the wizard is complete, click Download the License to save the .key file to your local computer. Phase 2: Importing the File into Kerio Control
After downloading the file, transfer it to a device (like a laptop) that can access the Kerio Control administration web interface.
Access the Admin Interface: Log in to the Kerio Control administration panel (typically via https://[IP-address]:4081/admin). Open Configuration Assistant:
On the Dashboard, locate and click the Configuration Assistant button in the bottom right corner. Kerio Control Offline License File
Click Register product (or "Update license info" if you are renewing). Choose Offline Mode:
In the registration window, look for the Register offline by license file link at the bottom right. Upload the File:
Click Browse and select the .key file you downloaded earlier.
Click Next and follow the remaining prompts to complete the registration. Key Considerations Registering Kerio Control - KerioControl - GFI
Title: How to Activate Kerio Control Using an Offline License File (Step-by-Step)
Post:
I’ve seen a few questions recently about activating Kerio Control (now GFI Kerio Control) on machines that don’t have direct internet access. If your firewall is in a high-security or air-gapped environment, the online activation will fail. Here’s how to use the Offline License File method.
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.
In the world of network security, few things are as frustrating as being locked out of your management console because your firewall can’t talk to the mothership. For IT administrators managing Kerio Control (now part of the GFI software family), the assumption is often that a constant internet connection is required for license validation. But what happens when you are securing an air-gapped military network, a remote manufacturing floor with no outbound web access, or a temporary event network?
Enter the Kerio Control Offline License File.
This unassuming text file is the silver bullet for one of networking’s most niche but critical problems: How to validate a paid, authenticated license on a firewall that has zero internet access. If your primary internet line fails and you
This article will dive deep into what an offline license file is, why you need it, how to generate it, and how to apply it without breaking your security posture.
Offline license files are version-specific (major releases). A license file generated for Kerio Control 9.4 will not work on 9.3 or 10.x. Always match the license to the exact software version.
Sometimes, an organization has internet access, but the proxy settings are so restrictive (e.g., requiring NTLM authentication or specific root CA certificates) that Kerio Control cannot perform its automated handshake. Manually importing an offline license bypasses the proxy drama.
On your internet-connected browser:
| Issue | Likely Fix |
|--------|-------------|
| “Invalid license file” | Regenerate the .req file and request a new .lic – do not edit the files manually. |
| License shows trial after upload | Your subscription may have expired; check the portal. |
| Offline option missing | Update to Kerio Control 9.4 or later – older versions handled licensing differently. |
To register Kerio Control using an offline license file, you must manually generate the file from the GFI/Kerio registration portal and upload it to your administration interface. This method is necessary for installations without an active internet connection or instances placed behind strict firewalls that block automatic registration. 🛠️ Step 1: Obtain the License File
If your Kerio Control unit is offline, you must generate the key file from another device with internet access.
Go to the Kerio Product Registration Portal on a machine with an active internet connection.
Enter your purchased license number and pass the security captcha. Follow the online registration wizard:
Verify your current license settings, owner information, and reseller details.
If registering a physical appliance, you may be prompted to enter the hardware serial number found on the bottom of the device. Title: How to Activate Kerio Control Using an
At the end of the wizard, click the option to download your physical file.
Save the generated license.key file to a USB drive or a local folder on the administrator computer. 💻 Step 2: Import the License File into Kerio Control
Once you have secured the physical file, log directly into your firewall management interface to upload it.
Open your web browser and navigate to the Kerio Control Administration Interface (the default address is usually https://10.10.10).
On the main Dashboard, look at the bottom right and click the Configuration Assistant button.
Click on the Register product link (or Update license info if updating an existing deployment).
In the lower right corner of the registration window that appears, click the hyperlink labeled Register offline by license file.
Click Browse, locate and select the license.key file you downloaded previously, and click Next.
Complete the prompt prompts in the registration wizard to apply the file. 🔍 Step 3: Verify the Registration
After importing the file, ensure the correct details are visible on your system: Registering Kerio Control - KerioControl - GFI