Deyda Consulting Blog

NetScaler ADC Firmware Upgrade

Regular firmware updates are one of the most important maintenance tasks in a NetScaler ADC infrastructure. In addition to new features, current firmware releases include important bug fixes and security-related patches. Especially in the case of security advisories or actively exploited vulnerabilities, firmware updates should be scheduled promptly.

Because a firmware upgrade can affect production services such as NetScaler Gateway, Load Balancing, Content Switching, AAA, GSLB, or SSL Offloading, it should never be performed without proper preparation. A structured approach reduces downtime and minimizes the risk of unexpected issues.

This article describes the recommended upgrade process for production NetScaler ADC environments.

Install new Microsoft Teams (version 2) in Citrix

The new version of Microsoft Teams (often referred to as “Teams 2.0”) has been the new standard since July 1, 2024.

For VDI environments, this means:

October 1, 2024 → End of Support (Classic Teams in VDI)
July 1, 2025 → End of Availability

In short:
There is no way back.

Citrix License Activation Service (LAS): Goodbye License Files

If you’re a Citrix customer and thinking “next week…” right now — understandable. But starting April 15, 2026, file-based Citrix license files will no longer work. This is not a warning; it’s a hard shutdown date.

That means: if you haven’t migrated to LAS by then, you risk real outages (apps, desktops, or features depending on the component and version).

LAS is not a migration of your workloads to the cloud. Your site continues to run on-premises (DDCs, StoreFront, VDAs, etc.).
The only thing that changes is the activation and licensing mechanism.

Workaround after Remote Assistance Error

After installing the January 2026 Microsoft security updates, Remote Assistance (msra.exe) no longer works on multiple Windows versions. This directly affects Citrix Director Shadowing, as the generated invite files can no longer be opened on patched systems.

The issue is caused by a security hardening related to CVE-2026-20824 – Windows Remote Assistance Security Feature Bypass Vulnerability. While the fix is technically correct from a security perspective, it currently breaks legitimate Remote Assistance workflows in enterprise environments.

Migration of Citrix databases

With the latest Citrix Virtual Apps & Desktops (CVAD) LTSR version, older SQL Server versions have been discontinued. If you want to keep your environment stable and supportable, there is no way around migrating the Citrix databases (site, logging, monitoring) to modern SQL servers (2019/2022). Whether cluster, always on or mirroring – the procedure remains essentially the same. In this article, I will show you step by step how to migrate securely.

1. Prerequisites

Complete backups of all Citrix databases
Backups/VM snapshots of the delivery controllers (DDCs)
New SQL Server (Cluster, Always On or Mirror)
Same SQL version on Principal and Mirror