AZTCOFW / TECHNICAL GUIDE
WAN Interface
- Check that the WAN IP address is correct (Interfaces > WAN)
- Using the wrong address could cause a failure of the ISP to deliver traffic to/from the firewall, among other issues
- Check that the WAN IP address has the correct subnet mask (Interfaces > WAN)
- An improper subnet mask such as /1 could cause connectivity issues to large portions of the Internet, using /32 for a mask can prevent the gateway from being found/used
- Check that WAN has a gateway and that the gateway IP is correct (Interfaces > WAN)
- This will interfere with automatic outbound NAT and route-to/reply-to handling
- Check that the WAN gateway is set as default (System > Routing)
- Without a default gateway traffic has no exit path
- Check that the WAN gateway shows Online (Status > Gateways)
- If it is not, verify the WAN settings and gateway settings, or use an alternate monitor IP
- Verify that the defined WAN gateway is actually the default (Diagnostics > Routes)
- Some other source such as a VPN may have changed the default gateway
Imported from the AZTCOFW knowledge base on 2026-09-05. Historical guidance may refer to older software versions. Confirm applicability before changing a production system.
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