After successfully upgrading the Citrix licensing server to version 11.17.2 build 51000, we encounter the error "Citrix license server unavailable" in Citrix Studio.

The error in Licensing Manager "The License Activation Service entitlement could not be retrieved, Check your connection to License Activation Service": The Server is unable to connect to the License Activation Service (LAS) at the endpoint (https://las.cloud.com:443).

This alert will trigger if the License Server is unable to reach the LAS (License Activation Service) at https://las.cloud.com:443. You can either open this endpoint in your environment to allow access to that address or ignore the alert if you are not using the LAS model.

The License Activation Service (LAS) is a new cloud-based licensing solution that enhances performance and customer experience while minimizing the risk of outages compared to the traditional licensing model (v6).

Follow the below steps to configure License Server for License Activation Service:

Register the License Server with Citrix Cloud for License Activation Service using Citrix Licensing Manager.

1. On the Citrix Licensing Manager, click Go to Registration, then click Register, and copy the generated code.
2. The network should allow outbound connections to the LAS endpoint. Add (https://las.cloud.com:443) to the firewall to ensure connection.
3. Log in to Citrix Cloud, ensure that your organization is onboarded using an account that includes the relevant licenses.
4. Go to Identity and Access Management > API Access > Product Registrations.
5. Click Register, paste the code, and click Register again.

Problem Cause

Starting with build 11.17.2 build 51000 version, Citrix Licensing includes the License Activation Service (LAS). LAS is a cloud-based licensing solution which provides new modules for activating Citrix products, offering a seamless and modern approach to license management.

https://docs.citrix.com/en-us/licensing/current-release/license-activation-service