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💬 Your Firewall Story Could Earn You $35 Across Two Platforms!
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Secure Start with Zyxel x Tailscale 🎁 Get 6 Months of Tailscale VPN Free, Before Oct.!
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[Trade-Up Program] 🔄 Time to Trade Up: Say Goodbye to Legacy USG, Hello to Next-Level Securi…
Time to Trade Up: Upgrade Your Legacy USG and Unlock a Powerful New Experience.
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Protect the link between the firewall and the switch
Hi I’m using MAC authentication on a GS1920-24 switch to prevent unauthorized devices from connecting to it. However, I can’t use MAC authentication on the uplink to the firewall. How can I ensure that only the firewall can connect to the switch, and only the switch can connect to the firewall? The firewall is a USG FLEX…
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VPN SSL: unable to access to a server folder
Hi I need to connect a remote pc to an internal server folder. My LAN is a domain network type and I'm running a USG 1100. I've configured the SSL VPN in the firewall and the remote pc is connected succesfully to the firewall. SecuExtender shows: Client IP: 192.168.200.11 Server IP: 217.xxx.xxx.xxx DNS: 192.168.0.2,…
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User name limitation that causes problem for MAC-Based Authentication
FLEX 200 So I've been configuring with 802.1x with a Cisco switch and FLEX 200 as Authentication RADIUS Server even when I could use Cisco built in option. So its really odd that my MAC was 08-00-27-EE-C7-AF but you can put that in FLEX200 because it must start with a letter so I change the MAC of the device to…
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ZyXel USG20-W - internet failing and VPN issue.
Hello, I am running quite old ZyXel USG20-W with latest firmware (upgraded today) and I started experiencing some issues couple days ago. We had internet connection outages while downloading big updates and so on. So we changed internet provider and swaped from 40Mb internet to 100Mb internet connection. We are now able to…
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ATP800 V5.41(ABIQ.0) firmware image corrupted
Hi, My ATP800 has been trying to update to firmware v5.41 since the release via auto update but encountering a checksum error on the download. I attempted to use the firmware file from the myZyzel portal, but could not boot with the 5.41 image. The firmware management page shows the new version number, but boot falls back…
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ETA for next ZLD 5.X firmware
If any… for the known and sharable information at this date.
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ZyWALL USG20W-VPN - Firmware V5.41(ABAR.0)
Hello, After upgrading to firmware V5.41(ABAR.0), VLAN-connected devices gradually lost connectivity. The main LAN remained functional. Restoring a backup configuration made before the firmware upgrade immediately restored all VLAN and DHCP functions. Firmware V5.41(ABAR.0) appears to break DHCP/VLAN bindings or…
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Politica para Bloqueo de Aplicaciones moviles en router mercusys coenctado a un usg flex 200
Muy buenas noches a todos, tengo conectado un router mercusys via lan a un sw no administrado, y estos a un firewall USG FLEX 200H, donde y como puedo hacer (Politica) para que los telefonos moviles que se coencten via wifi, no me permita abrir las apps de facebook, tiktok, youtube, twich, x, solo me permita whatsapp.…
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Admin password reset
Is there a procedure to reset the admin password for my USG-20 Firmware 4.73? I already tried tit atgk -u but it seems doesn't work. Any help is appreciated.
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Vlan1 On Primary LAN Interface
Hello, I have a HUGE security concern about this topic and I am running a Flex USG500H and I spoke to tech support and discovered that I am not able to change the primary LAN interface (192.168.1.1) to any other vlan other then the default vlan1 and that is designed that way. In my opinion that is a security "No No". This…
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USG 20w/50 Flex
Hi, please help to understand strange situation. Due to USG prepare for production, I did some settings in test environment via browser, set interfaces, dhcp bind, server & e.t.c, so no action might disrupt communication via cable. Suddenly I lost connection, no ping, no http. Was restart but no effect. Connect via console…
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General rule possible to allow IPSec VPN traffic only, from everywhere? I am also using GeoIP
Hello, I have the newest firmware installed on a USG20W-VPN and regularly update the GeoIP database on the firewall. I use only IPSec VPNs, with SecuExtender client from MacOS and Win11, native IPSec VPN from iPhone, and Strongswan IPSec VPN from Android. All works- so far so good. It is no rocket science for IPSec VPN: it…
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Zyxel Firewall Security Service Incident 2025-10-20 06:49 ~ 10:47 (UTC+0)
Dear Zyxel firewall users, The Zyxel firewall security services had some issues due to an incident from AWS. Issue Started from: 2025-10-20 06:49 (UTC+0) Resolved: 2025-10-20 10:47 (UTC+0) Issue Symptom & Risk: These functions are effected: Firmware upgrade Signature upgrade Cloud query Sandbox Threat Intelligence service…
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IPv6 configuration with RDNSS (RFC 6106)
Hello, We are MSP which deployed IPv6 internally on one of client's existing Zyxel firewall. The device in question is an USG Flex 200 running firmware 5.40 (latest). Coming from Fortinet / FortiOS we find the IPv6 configuration on Zyxel convoluted as there is no official knowledge base (aside from random official blog…
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Problem l2tp connect
Good evening, We have a Zyxel VPN 100 and the L2TP protocol enabled, which several users with Macs with their configurations use. Everything worked for a week now, but it no longer works without any changes. Can you tell us what the problem is based on the logs I've attached and how to fix it? warn sessions-limit ACCESS…
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BWM problem with wildcard FQDN to Guaranteed Bandwidth
USG FLEX 200 V5.40(ABUI.0) SFP WAN LAN 192.168.255.237 255.255.255.192 interface Egress limit 81920Kbps BWM rule 1 incoming LAN1 outgoing SFP destination *googlevideo.com Guaranteed Bandwidth Inbound 71680Kbps Outbound 3200Kbps maximize bandwidth checked Priority 7 note setting the Priority higher does not help…
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Forticlient VPN thru USGFLEX50
Hi everyone. I need to let my notebook connect to an external VPN on a fortigate via IPsec (FortiClient IPsec). Everything works fine except for being at office where my USGFLEX50 seems not to let me connect to the external fortigate. Obviously my notebook has no filters outgoing and I can see IKE packet ougoing correctly…
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NAT rule "allow remote IP" on USG LITE 60AX no subnets?
First go around with the USG LITE 60AX. NAT rules "allow remote IP" doesn't seem to support a subnet, only a single IP (unless I'm doing something wrong). Is the only option to leave it at Any, the create firewall rules to limit allowed inbound subnets? Do NAT rules in this case also implicitly create the matching firewall…
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USG Flex 200 Connectivity Check
Any documentation on running connectivity check from the command line of the device?
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USG Flex 100H and GS1920-24HPv2 VLAN and LAG Internet speed issue
Hi, USG fw: V1.35(ABXF.2) Switch fw: V5.00(ABMI.1) I've configured everything needed: separate zones (not using existing LAN zone), VLANs, policies, configured LAG (LACP) on 3 ports and connected to switch. Everything seems to be fine, however, after that I decided to test Internet speed using services like speedtest.net…
