[ATP/FLEX]Why NAT loopback does not work on USG FLEX/ATP Series?

Zyxel_Kevin

Question: A user can access an internal website with Internal IP but not on WAN IP. How can this issue be resolved?

Answer: 

It might be NAT loopback does not work as expected.

Please ensure the Virutal server WAN address in setting page is bound to the public IP instead of Any. 

If you use "ANY", the Firewall will not automatically create nat loopback rules