Welcome to the Firewall FAQ section of Zyxel's Technical Portal. The Zyxel USG FLEX H Series Firewalls are critical for protecting your network from unauthorized access and cyber threats. Whether you are configuring security policies, troubleshooting connectivity issues, or optimizing performance, this guide addresses the most common questions about the USG FLEX H Series. We aim to help you maintain a secure, efficient, and high performance network environment with the advanced capabilities of Zyxel's next-generation firewalls.
| Frequently Asked Questions |
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Critical Updates
Please stay updated with key security updates.
Beta Area
Are you interested in trying out our new Beta version?
Introduction and basic setup
USG FLEX H Series [Firewall] - Initial Setup Wizard
Easy Support Assistance
- USG FLEX H Series [Firewall] - How to creating a Diagnostic File
- USG FLEX H Series [Firewall] - How to allow HTTPS Web GUI Access from WAN?
- USG FLEX H Series [Firewall] - Right Console Cable and LED Indication
- USG FLEX H Series [Firewall] - Packet Capture
- Zyxel USG FLEX H [Firewall] - Bootup Status Introduction on USG FLEX H Series Firewall
- USG FLEX H Series [Firewall] - reset or reboot the device and LED light indicates your H Series Firewall
- USG FLEX H Series [Firewall] - upgrade/update procedure
- USG FLEX H Series [Firewall] - Overview of CLI Commands for H Series
- USG FLEX H Series [Firewall] - how to backup/restore a configuration file
- USG FLEX H Series [Firewall] - Configure IPSec Site-To-Site VPN on USG FLEX H Series Firewall with static IP
License Selection
Find a suitable license for your Zyxel device!
VPN Overview
- USG FLEX H Series [Firewall] - Configure IPSec Site-To-Site VPN on USG FLEX H Series Firewall with dynamic IP
- Zyxel Firewall [VPN] - Why can't I establish a VPN connection after updating to macOS Sonoma
- USG FLEX H Series [Firewall] - How to Configure IKEv2 Remote Access VPN with Apple MAC OS Sonoma native VPN client?
- USG FLEX H Series [Firewall] - IPSec Site-to-Site VPN one Site is behind a NAT
- USG FLEX H Series [Firewall] - Configure IPSec Site-To-Site VPN on USG FLEX H Series Firewall with static IP
- USG FLEX H Series [Firewall] - VPN Clients Options
Security services
- USG FLEX H Series [Firewall] - How to use the Geo-IP feature?
- Zyxel USG FLEX H Series [Firewall] - Protection Key Features Overview
- Zyxel Firewall [NAT] - how to configure NAT 1 to 1 (Network Address Translation ) on the Zyxel USG Flex H Series firewall
- Zyxel Firewall [NAT] - What is NAT (Network Address Translation)
- Zyxel Virtual Server (Port Forwarding) [NAT] - how to configure Virtual Server (Port Forwarding) on the Zyxel USG Flex H Series firewall
New Features
- USG FLEX H Series [Firewall] - Device Insight
- 2FA with REINER SCT Authenticator
- USG FLEX H Series [Firewall] - Key advantages and comparison of USG FLEX H vs USG FLEX Series
- USG FLEX H Series [Firewall] - What’s New in uOS 1.20
- USG FLEX H Series [Firewall] - Comparison Operating System Feature Table ZLD 5.38 V.S. uOS 1.20
Troubleshooting
For more information browse through our article section: Click to start!