[FAQ-E] Zyxel USG FLEX H Firewall [uOs] - SSL VPN Error - The number of subnets you set has reached the limit.

The error message "SSL VPN - The number of subnets you set has reached the limit" on a Zyxel USG FLEX H firewall indicates that you’ve hit the maximum allowed number of address objects or subnet routes that can be associated with your SSL VPN configuration.

What does the error “SSL VPN - The number of subnets you set has reached the limit” mean on Zyxel USG FLEX H?
It means you've reached the device’s maximum allowed number of subnets for SSL VPN. This is a system limitation.

Option 1: Consolidate Subnets

If multiple subnets can be grouped, use CIDR summarisation:

• Instead of 192.168.1.0/24, 192.168.2.0/24, 192.168.3.0/24

• Use 192.168.0.0/22 to represent all four.

Option 2: Remove Unused Subnets

Audit existing SSL VPN settings:

• Remove old/inactive entries not used in the current VPN configs