What is the difference between deny and reject in Security Policy?

Zyxel_James

Question
When configuring Security Policy, you will see the actions "Deny" and "Reject", what's the difference in the behavior between Deny and Reject?

Answer
Both deny and reject are intended to block traffic, however, the difference is whether the traffic will be blocked with a response message or not.

If the Firewall settings are set to deny, you will see the message Request timed out.

If the Firewall settings are set to reject, you will see the message Destination host unreachable.