Fortinet 443 FortiWeb 5.0 Patch 6 Administration Guide
Setting name Description
Name Type a unique name that can be referenced in other parts of the
configuration. Do not use spaces or special characters. The
maximum length is 35 characters.
Action Select which action the FortiWeb appliance will take when it detects
a violation of the rule:
•Alert — Accept the connection and generate an alert email
and/or log message.
•Alert & Deny — Block the request (reset the connection) and
generate an alert and/or log message.
You can customize the web page that will be returned to the
client with the HTTP status code. See “Uploading a custom error
page” on page 467 or Error Message.
•Period Block — Block subsequent requests from the client for a
number of seconds. Also configure Block Period.
You can customize the web page that will be returned to the
client with the HTTP status code. See “Uploading a custom error
page” on page 467 or Error Message.
Note: If FortiWeb is deployed behind a NAT load balancer, when
using this option, you must also define an X-header that
indicates the original client’s IP (see “Defining your proxies,
clients, & X-headers” on page 266). Failure to do so may cause
FortiWeb to block all connections when it detects a violation of
this type.
The default value is Alert.
Caution: This setting will be ignored if Monitor Mode is enabled.
Note: Logging and/or alert email will occur only if enabled and
configured. See “Logging” on page 542 and “Alert email” on
page 576.
Note: If you will use this rule set with auto-learning, you should
select Alert. If Action is Alert & Deny, or any other option that causes
the FortiWeb appliance to terminate or modify the request or reply
when it detects an attack attempt, the interruption will cause
incomplete session information for auto-learning.
Block Period Type the number of seconds that you want to block subsequent
requests from the client after the FortiWeb appliance detects that
the client has violated the rule.
This setting is available only if Action is set to Period Block. The
valid range is from 1 to 3,600 (1 hour). The default value is 60. See
also “Monitoring currently blocked IPs” on page 606.
Severity When rule violations are recorded in the attack log, each log
message contains a Severity Level (severity_level) field. Select
which severity level the FortiWeb appliance will use when it logs a
violation of the rule:
•Low
•Medium
•High
The default value is High.