Offline License File - Kerio Control

Is this a , or are you hosting it on a virtual machine (VMware, Hyper-V, VirtualBox)?

Administrators must configure the behavior of Kerio Control upon license expiration. In high-availability environments, a fail-open configuration (allowing traffic to pass but disabling scanning features) maintains business continuity at the cost of security. A fail-closed configuration blocks all traffic, prioritizing security over uptime.

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Managing offline licenses can occasionally trigger errors, particularly regarding certificate validity or module synchronization. 1. Error: "Invalid License File Structure" Kerio Control Offline License File

The administrator manually downloads the certificate-backed .lic file from a device with internet access and uploads it directly to the local Kerio Control administration dashboard. When Do You Need an Offline License?

This error usually indicates file corruption during transfer. Ensure that the file was not modified, renamed incorrectly, or opened in a text editor that stripped its formatting. Always transfer the file in binary mode if using command-line tools. 2. "Server GUID Mismatch"

Activating your firewall offline requires a secondary device that has internet access. Follow these steps to generate and apply your file. Step 1: Collect Your Hardware Information Is this a , or are you hosting

Click , locate and select the license.key file you downloaded previously, and click Next .

Locate and copy your unique (sometimes listed as the Hardware ID). Keep your purchased License Key (serial number) handy. Step 2: Download the License File

If the system clock on the Kerio Control appliance is incorrect, it may perceive a newly generated license file as expired or not yet valid. Ensure the hardware clock (RTC) is accurate, or sync the firewall to an internal Network Time Protocol (NTP) server within your isolated network. This is essential for secure

If you are running the initial configuration wizard, proceed until you reach the screen and select Register Offline .

The license file is cryptographically locked to the specific hardware or virtual machine GUID submitted during generation. If you reinstall Kerio Control on new hardware or restore a backup to a different virtual host, the old offline license file will reject the activation. You must generate a new file using the new system's GUID. 3. Date and Time Discrepancies

Open your web browser and navigate to the official or Kerio Activation page.

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

If your Kerio Control sits behind a corporate proxy that requires NTLM authentication, the appliance might not be able to reach update servers. While you can configure a proxy in Kerio, some legacy versions struggle. The offline file solves the chicken-and-egg problem.