Kerio Control Offline License File Jun 2026

Kerio Control does not limit the number of defined user accounts you can create. However, if the maximum number of currently is reached, no more users will be allowed to connect to the network until an existing user disconnects.

This paper explores the technical architecture and administrative workflow of the offline licensing mechanism within GFI Kerio Control firewall software. As network security appliances are frequently deployed in high-security, air-gapped environments where internet connectivity is restricted or non-existent, the ability to manage software licensing without a direct link to the vendor’s cloud infrastructure is critical. This document details the file structure of the license container, the challenge-response mechanism used for validation, best practices for lifecycle management, and the security considerations surrounding offline license storage.

: Provide your purchased Server License Number and solve the captcha.

While online activation is the default method, several real-world scenarios necessitate the use of an offline license file: Kerio Control Offline License File

If you see errors like "License server unreachable" or "Activation quota exceeded," moving temporarily to an offline file can stabilize the firewall while you fix DNS or NAT issues.

To get your offline license, you must visit the official Kerio Product Registration page from a device that .

Unlike an online license (which uses a serial number to auto-activate via license.gfi.com ), an offline license file is a cryptographically signed .lic file. It contains: Kerio Control does not limit the number of

However, offline activation becomes necessary when:

: Access your Kerio Control firewall's web administration interface by navigating to https://<your_kerio_ip_address>:4081 and logging in as the administrator.

When you purchase a license, you receive a , which is a combination of letters and numbers. When online, the firewall contacts the manufacturer's licensing server to convert this key into the full license file. However, when operating offline, you must manually complete this process. The manufacturer provides a web portal that serves as an offline registration alternative. You provide your license key to this portal, and it returns a downloadable license.key file. You then take this file to the offline Kerio Control device and manually import it. As network security appliances are frequently deployed in

How does offline licensing compare to pfSense, Sophos, or OPNsense?

: If a hardware box rejects a key, the license might be missing the correct OS and extension values . Contact GFI Sales to obtain a modified file.

Click , select your downloaded license.key file, and click Next .

: Check that your license details are correct. If you find discrepancies, GFI Customer Care recommends stopping and submitting a support ticket.