After you configure the LAN or WAN interface of your Symantec Gateway Security 300 Series or 400 Series appliance and save the changes, you see the following error message:
"Failure: WAN Subnet Conflicts with LAN Subnet."
This error message indicates that the IP addresses that you assigned to the WAN and LAN interfaces are part of the same subnet. For example, the WAN IP address of your appliance is 192.168.0.2 and the LAN IP address is 220.127.116.11. Because both addresses are part of the same subnet, traffic cannot pass through the firewall properly.
This problem often occurs if the appliance is installed behind a NAT device.
To resolve this problem, make sure that the LAN and WAN interfaces are connected to different subnets.
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