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📢 Announcements

[2026 May Tips & Tricks] Visibility & baseline control – The first line of defense for GenAI
The rapid adoption of Large Language Models (LLMs) like ChatGPT, Gemini, and Claude has left many IT departments playing catch-up. While these tools offer incredible efficiency, they often enter the workplace as "Shadow AI"—unmanaged, unmonitored, and potentially risky. To manage this effectively, modern IT needs to start…
NebulaFlex Switch XGS1935 Series - V4.90 Patch 3 Firmware Release
Zyxel Switch XGS1935 Series Release Note April 2026 Firmware Version on all models (Click Hyperlink to download the firmware directly) Zyxel XGS1935-28HP - V4.90(ACJX.3)C0 Zyxel XGS1935-28 - V4.90(ACJW.3)C0 Zyxel XGS1935-52HP - V4.90(ACJZ.3)C0 Zyxel XGS1935-52 - V4.90(ACJY.3)C0 New Feature and Enhancements 1. Optimized…
NebulaFlex Switch XS3800 Series - V4.80 Patch 5 Firmware Release
Zyxel Switch XS3800 Series Release Note April 2026 ZyNOS Firmware Version on all models (Click Hyperlink to download the firmware directly) Zyxel XS3800-28 - V4.80(ABML.5)C0 New Feature and Enhancements 1. Optimized system stability and synchronization with Nebula to enhance overall device connectivity and management…
NebulaFlex Switch GS1920 Series - V5.00 Patch 3 Firmware Release
Zyxel Switch GS1920 Series Release Note April 2026 Firmware Version on all models (Click Hyperlink to download the firmware directly) Zyxel GS1920-8HPv2 - V5.00(ABKZ.3)C0 Zyxel GS1920-24v2 - V5.00(ABMH.3)C0 Zyxel GS1920-24HPv2 - V5.00(ABMI.3)C0 Zyxel GS1920-48v2 - V5.00(ABMJ.3)C0 Zyxel GS1920-48HPv2 - V5.00(ABMK.3)C0 New…
NebulaFlex Switch GS1915 Series - V4.70 Patch 7 Firmware Release
Zyxel Switch GS1915 Series Release Note April 2026 Firmware Version on all models (Click Hyperlink to download the firmware directly) Zyxel GS1915-8 - V4.70(ACAP.7)C0 Zyxel GS1915-8EP - V4.70(ACAQ.7)C0 Zyxel GS1915-24E - V4.70(ACDR.7)C0 Zyxel GS1915-24EP - V4.70(ACDS.7)C0 New Feature and Enhancements 1. Optimized system…
[Release Note] Zyxel BE Series Access Point - V7.30 Patch 4 firmware has been released
BE Series Access Points Firmware Release Note April 2026 Overview This document provides firmware release information on Zyxel Access Points platforms, introduce new Access Points, new features and enhancements, bug fix, known issues and workarounds information for Release V7.30 Patch 4 C0. Supported Platforms (Click…
USG FLEX H Series - V1.38 Patch 0 Firmware Release
Zywall USG FLEX H Series Release Note April 2026 Firmware Version on all models * Please use the cloud firmware upgrade function to upgrade USG FLEX H Series USG FLEX H SeriesFirmware…
[Zyxel Circle] Auto-Renewal Service for USG FLEX H Series Is Now Available in Circle
Circle partners can now enable Auto-Renewal for supported USG FLEX H Series security licenses directly in Zyxel Circle. Once enabled, your eligible license plan can renew automatically to help reduce manual follow-up and keep service coverage running smoothly. Why enable Auto-Renewal in Circle? More USG FLEX H Series…
[Release Note] Nebula Control Center - 20.00 software Release!
Zyxel Nebula Control Center Release Note Common NCC (Organization,Site-wide,etc.): * Elevated the MSP Portal with Google Maps integration, providing an intuitive way to visualize and navigate organizations globally. (Nebula MSP Pack license is required) * Refined the MSP Admin & Teams and corresponding Org-wide…
NebulaFlex Switch XMG2230 Series - V2.00 Patch 1 Firmware Release
Zyxel Switch XMG2230 Series Release Note March 2026 FaOS Firmware Version on all models (Click Hyperlink to download the firmware directly) Zyxel XMG2230-28HP - V2.00(ACNN.1)C0 Zyxel XMG2230-52HP - V2.00(ACNO.1)C0 New Feature and Enhancements 1. Enlarge Multicast group from 1K to 4K. 2. Support querier flooding GSQ to all…

Latest Discussions

10G SFP+ link flapping between Zyxel XS1930-10 and MikroTik CSS610-8G-2S+IN — MM SR unstable but 1G
Hi I have a question on transceiver, which I bought from a OEM compatible supplier, https://www.fibermanialink.com/product/10g-xfp-transceiver-10gbase-lr-20km-sm-1310nm/ I’m facing a strange issue when trying to establish a stable 10G link between a Zyxel XS1930-10 and a MikroTik CSS610-8G-2S+IN using SFP+ ports. Setup:…
USG FLEX H - LAG Interface edit Transmit Hash Policy issue
Hi, editing "Transmit Hash Policy", changing from src-dst-ip-mac to src-dst-mac and viceversa, made the firewall unresponsive. I had another interface for configuring USG FLEX 200 H via Ethernet, so it wasn't the same LAG interface I was editing. HTTP access works, but I cannot use any command since it logs me out…
NAS326 unresponsive after update and reset
Hello there, some weeks ago I've updated my NAS326 to last available firmware (5.21(AAZF.18)C0). Until then it was working without issues for years. After update, I lost access to login page: ping works but anything else was not available anymore. Luckily, I had data backup on another NAS, so I tried to factory reset this…
Nebula 20.00 - How could I block multple VLANs combinations via firewall?
Hello everyone, inside an ORG I have 4 VLANs in this moment. It is essential that all of them DO NOT connect to VLAN1 and to ZyWALL. For this reason I went here: So I told the firewall to block these segments: As you can see I miss to deny VLAN20 to VLAN50, VLAN20 to VLAN30, VLAN20 to VLAN60 and so on for the rest. The…
USG FLEX 200H: LAG LACP Interface Issue
Hi, in my scenario I have a stack of two XGS3700-48HP, firmware V4.30(AAGF.3),and a LAG of two ports on which I've connected public network. I had ATP500 Firewall connected on that LAG with the external interface and it worked fine for years since I've changed with USG FLEX 200 H, firmware V1.38(ABWV.0). Both LAGs where…
Lost UDP natting after 1.38 upgrade on Flex 700H
Hello, I have a couple of Flex 700H upgaded from 1.36 to 1.38, with multiple public IP addresses on each of them. I natted some services managed by appliances connected on the DMZ, among them a SSL VPN working with both TCP and UDP connections on port 443 on one of the public IPs. Since the upgrade, tunnels using UDP…
The Block QUIC Protocol bug
FLEX H V1.38(ABZI.0) and V1.38(ABZI.0)ITS-26WK16-m11228 So this option was a pain to know about due to it somewhat working and well really not working you can find this option in system > advanced So here the problem for what tests I have done and think bug is. So lets say Block QUIC Protocol is enabled and the LAN is…
USG FLEX H - Zone member issue
Hi, I noticed that if I have an Interface and an IPSec VPN with the same name, configuring Zone members has some issues: When you check one object, it checks both. When you add both, save, and go back to the configuration, they are doubbed and again, when you select one of they, all 4 will be selected Thank you for…
USG FLEX H - Session monitor - "No data"
Hi, I noticed that when I enter Traffic Statistics - Session Monitor, and select "View: sessions by source IP" for example, I get the list of session grouped by source IP and the counter in the last column. If I click the counter, I get always "No data" as response. Javascript console reports Firmware 1.38. Thank you for…
Why was the SSL VPN client not receiving DNS IP on USG FLEX H device?
Question: Why was the SSL VPN client not receiving DNS IP on USG FLEX H device? Answer: The issue occurred when the DNS was set to “ZyWALL” or certain other combinations in the global DNS setup for SSL VPN. This configuration caused the SSL VPN client (e.g., OpenVPN or SecuExtender) to miss custom DNS settings. This…

Latest solutions

10G SFP+ link flapping between Zyxel XS1930-10 and MikroTik CSS610-8G-2S+IN — MM SR unstable but 1G
Hi I have a question on transceiver, which I bought from a OEM compatible supplier, https://www.fibermanialink.com/product/10g-xfp-transceiver-10gbase-lr-20km-sm-1310nm/ I’m facing a strange issue when trying to establish a stable 10G link between a Zyxel XS1930-10 and a MikroTik CSS610-8G-2S+IN using SFP+ ports. Setup:…
USG FLEX H - LAG Interface edit Transmit Hash Policy issue
Hi, editing "Transmit Hash Policy", changing from src-dst-ip-mac to src-dst-mac and viceversa, made the firewall unresponsive. I had another interface for configuring USG FLEX 200 H via Ethernet, so it wasn't the same LAG interface I was editing. HTTP access works, but I cannot use any command since it logs me out…
NAS326 unresponsive after update and reset
Hello there, some weeks ago I've updated my NAS326 to last available firmware (5.21(AAZF.18)C0). Until then it was working without issues for years. After update, I lost access to login page: ping works but anything else was not available anymore. Luckily, I had data backup on another NAS, so I tried to factory reset this…
Nebula 20.00 - How could I block multple VLANs combinations via firewall?
Hello everyone, inside an ORG I have 4 VLANs in this moment. It is essential that all of them DO NOT connect to VLAN1 and to ZyWALL. For this reason I went here: So I told the firewall to block these segments: As you can see I miss to deny VLAN20 to VLAN50, VLAN20 to VLAN30, VLAN20 to VLAN60 and so on for the rest. The…
Lost UDP natting after 1.38 upgrade on Flex 700H
Hello, I have a couple of Flex 700H upgaded from 1.36 to 1.38, with multiple public IP addresses on each of them. I natted some services managed by appliances connected on the DMZ, among them a SSL VPN working with both TCP and UDP connections on port 443 on one of the public IPs. Since the upgrade, tunnels using UDP…
The Block QUIC Protocol bug
FLEX H V1.38(ABZI.0) and V1.38(ABZI.0)ITS-26WK16-m11228 So this option was a pain to know about due to it somewhat working and well really not working you can find this option in system > advanced So here the problem for what tests I have done and think bug is. So lets say Block QUIC Protocol is enabled and the LAN is…
USG FLEX H - Zone member issue
Hi, I noticed that if I have an Interface and an IPSec VPN with the same name, configuring Zone members has some issues: When you check one object, it checks both. When you add both, save, and go back to the configuration, they are doubbed and again, when you select one of they, all 4 will be selected Thank you for…
USG FLEX H - Session monitor - "No data"
Hi, I noticed that when I enter Traffic Statistics - Session Monitor, and select "View: sessions by source IP" for example, I get the list of session grouped by source IP and the counter in the last column. If I click the counter, I get always "No data" as response. Javascript console reports Firmware 1.38. Thank you for…
How to prevent the IKE daemon from responding to IKEv1 requests?
Running latest firmware on a USG20W-VPN. All my IPSec clients (SecuExtender on Win11/macOS, native iOS, strongSwan on Android) are IKEv2 only. The VPN gateways are configured as IKEv2 only - the IKE Version radio button is set to IKEv2 and greyed out (as expected). Despite this, the IKE daemon still engages with inbound…
IPSec VPN does not work with latest MacOS, restoring a configuration does NOT reinstall the VPN part
Hi all, I have seen the instructions posted in the VPN section and followed them to install IPSec VPN on the newest MacBook with newest MacOS. Older MacOS and notebooks worked fine with the IPSec VPN. Before: IPSec VPN works for Androids and Windows and older MacOS, but does not work with the newest MacBooks with newest…

Unanswered Discussions

USG FLEX 200H: LAG LACP Interface Issue
Hi, in my scenario I have a stack of two XGS3700-48HP, firmware V4.30(AAGF.3),and a LAG of two ports on which I've connected public network. I had ATP500 Firewall connected on that LAG with the external interface and it worked fine for years since I've changed with USG FLEX 200 H, firmware V1.38(ABWV.0). Both LAGs where…
DX3301-T0 problems
Hey, I live in a shared home. For the first 2 days after this router was installed, the internet worked perfectly. Then it stopped working. When I try to use it, this happens: But the ISP router is working and supplying internet. Everything is correctly plugged in and switched on. We have done the off/on, restart thing…
DX3301-T0 Germany version firmware
I wonder if there is a new firmware version for the router DX3301-T0/DE ? The current firmware is V5.50(ABVY.4) D0. I'm curious if there's a new version for my model, and I personally own that router, not from an ISP. Thank You!
Firmware for SBG3600-N000
Hi! Who can help me out here, i'm looking for the latest firmware version for this older product. Issue is, seems like i'm unable to download this anywhere. Currently running on MAIN V1.00(AAKO.4) WWAN 1.15 LTE ALT3100_04_05_06_10_B8_LO Is there anyone who can hook me up with the latest and greatest version by any chance?…
Router and chromecast issue
Hi! I have an NBG6602 zyxel router that have worked great for a few years. Now it started acting up with my chromecast. I can configure my chromescast and connect it to the wifi using my phone, but my phone then can't find the chromecast. My phone says that it's either not connected to the same wifi (but they are) or that…
Hole in the back wall NR7101
It seems to be a small hole in the back wall in the NR7101, does anyone know why? And can this hole be a problem with water ingress when the router is located in a harsh environment? Should it be blocked?
Tried everything to connect my router
Tried everything to connect my router still cannot get it right
DX3301-T0 & WX3100-T0 Firmware releases
Hello all, I am a happy owner of the DX3301 and 3 WX3100 extenders. I have just checked the download center for a regular firmware update like I periodically perform, However, the firmware appear to be not present on on the download pages. I know v5.70 is out as per the user manual. I have checked the EoL notices as well…
DX3301-T0 - multiple local vlanned subnets (ethernet and SSID-vlan mapping)
I am trying to split my increasingly complex home network into several vlans for administrative security and ease of management DX3301 advertising material claims that the router handles multiple local subnets and tagged vlan support, however I have been unable to achieve the following: 1: Associating SSIDs with vlans (no,…
ZYXEL NR7302 origin detection
I bought a Zyxel NR7302 over the internet, there is software 1.00(ACHA.2)b3_D0_1026, I need to find out what ISP it was configured for. SN: S230Z47006271

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Stories

Let's learn how Zyxel users are building successful infrastructure and share your own success stories using Zyxel products!

Strengthening Guest Experience and Secure Operations at 5-Star Hotel
Noura The Palace ——————————————————————————————————————————————————————— Overview When Noura Hotel opened its doors in Dera Bassi, Chandigarh, the management understood that luxury alone would not set them apart. Spread across a sprawling 400m by 200m property, the hotel needed to meet the expectations of modern guests who…
Serving Up Secure Networking for Café Customers
Stables Speciality Coffee Co. ——————————————————————————————————————————————————————— Overview Stables Speciality Coffee Co. had just opened and had lots of customers who came to the café to work remotely. The café set up some charging points so laptops could be used as required, but the available WiFi wasn't secure. They…
Powering Future-Ready Classrooms at the Al Education Center in Korea
Al Convergence Education Center ——————————————————————————————————————————————————————— Overview The Al Convergence Education Center in Incheon is designed for digital learning in Al and software convergence technologies. LG HelloVision developed the future classroom platform, Ring School. Students receive a laptop or…