Fix: Verify that the Pre-Shared Key matches perfectly. Ensure that UDP ports 500 and 4500 are not blocked by your local internet service provider (ISP) or home router.
Installation and Configuration (Typical Steps)
Where to Download the Zyxel IPSec VPN Client
I can provide the exact step-by-step configuration commands for your hardware. Share public link
During installation, Windows will ask to install a virtual network adapter driver. Click Install .
Once installed, you will not find a desktop shortcut by default. Look for the or Zyxel VPN Client icon in your system tray (bottom-right corner, near the clock).