Why is the Virtual Server or 1:1 NAT configuration correct, but the NAT still cannot work?

Zyxel_Jeff
Zyxel_Jeff Posts: 1,316  Zyxel Employee
100 Answers 500 Comments Friend Collector Fourth Anniversary

Background and Scenario:

We have noticed that some users encounter a situation where the Virtual Server or 1:1 NAT configuration is correct, but the NAT still does not work. What could be the possible reason for this issue?

NAT rule.png

Answer:

The possible reason is usually related to the security policy allowing the traffic from WAN to LAN otherwise the traffic would be blocked by the security policy.

NAT rule_security policy.png

Additionally, please ensure that the NAT traffic can be accepted by the LAN host server, and that the destination directory is accessible via specific TCP/UDP ports.

Tagged: