[2023 October Tips & Tricks] Why deprecate L2TP over IPSec in the USG FLEX H Series?

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Why deprecate L2TP over IPSec in the USG FLEX H Series?

L2TP over IPSec was a popular VPN protocol in the past, but it has become less common and is often deprecated and discouraged for several reasons:

Security Concerns: It does NOT provide encryption or confidentiality to traffic passing through it. It relies on other protocols like IPsec for encryption and security.

Limited Platforms: Not all platforms and devices support L2TP/IPSec. For example, some mobile devices and operating systems have moved away from supporting this protocol in favor of more modern and secure alternatives. Android has removed L2TP VPN in its version 12 onward so that consumers can enjoy better security, performance, and interoperability with other systems.

Performance: L2TP over IPSec can be less efficient in terms of performance compared to newer VPN protocols. The additional overhead introduced by the combination of L2TP and IPSec can result in reduced throughput, which may be a concern in high-speed or high-bandwidth scenarios.

Zyxel is determined to deprecate the L2TP over IPSec in favor of a more modern and secure VPN protocol like IKEv2 in our USG FLEX H series, while keeping L2TP over IPSec in the ZLD-based product lines USG FLEX series and ATP series. IKEv2 is a VPN protocol known for its security, reliability, and efficiency. The best part is it’s widely adopted and provides outstanding interoperability, working with different types of VPN clients, OS, and VPN gateway.

To help our customers migrate to IKEv2, we provide Remote VPN Wizard in every product (ZLD, uOS, Nebula firewall, and future SCR), which generates a VPN script for use with free OS native- IKEv2 VPN clients e.g., Windows, macOS, iOS, Android (StrongSwan) in just a few clicks. As a result, our customers can enjoy the benefits of IKEv2 without the additional cost of purchasing IKEv2 client software.

With the subscription-based Zyxel SecuExtender VPN client, we take a step further allowing customers to enjoy auto-provisioning by simply retrieving the VPN settings right from our firewalls.


Office versions and connectivity to Microsoft 365 services

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Office versions and connectivity to Microsoft 365 services

The following table lists the Office versions that are supported for connecting to Microsoft 365 services. For example, connecting to Exchange Online, SharePoint Online, or OneDrive for Business.

Office version Supported for connecting until this date
Microsoft 365 Apps Supported as long as you’re using a supported version.
Office LTSC 2021 October 13, 2026
Office 2019 October 10, 2023
Office 2016 October 10, 2023


As stated in a April 2017 blog post, only perpetual Office versions in mainstream support are supported for connecting to Microsoft 365 services. Office 2016 is no longer in mainstream support, but we made an exception for it until October 2023, as stated in a September 2018 blog post.

Older Office versions not supported for connecting to Microsoft 365 services

Older Office versions might still be able to connect to Microsoft 365 services, but that connectivity isn’t supported.

In practical terms, what this means is that these older Office versions might not be able to use all the latest functionality and features of Microsoft 365 services. In addition, over time, these older versions might encounter other unexpected performance or reliability issues while using Microsoft 365 services. That’s because as we make improvements to Microsoft 365 services, we’re not taking into account or testing with these older Office versions.

We won’t take any active measures to block older Office versions from connecting to Microsoft 365 services if they’re in extended support and are kept up to date. This includes Office 2019 and Office 2016 after October 10, 2023. Both of these versions are in extended support until October 14, 2025.

Therefore, to provide the best experience with using Microsoft 365 services, we strongly recommend that you move off older Office versions to versions supported for connecting to Microsoft 365 services.