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FortiGate-4000 Administration Guide
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Predefined signature list
You can enable or disable groups of predefined signatures and configure the settings 
for individual predefined signatures from the predefined signature list.
Figure 141:A portion of the predefined signature list
 describes each possible action you can select for predefined signatures.
Group Name
The signature group names.
Enable
The status of the signature group. A white check mark in a green circle 
indicates the signature group is enabled. A white X in a grey circle indicates 
the signature group is disabled. 
Logging
The logging status for individual signatures. Click on the blue triangle to 
show the signature group members. A white check mark in a green circle 
indicates logging is enabled for the signature. A white X in a grey circle 
indicates logging is disabled for the signature. 
Action
The action set for individual signatures. Click on the blue triangle to show 
the signature group members. Action can be Pass, Drop, Reset, Reset 
Client, Reset Server, Drop Session, Clear Session, or Pass Session. See 
Revision
The revision number for individual signatures. To show the signature group 
members, click on the blue triangle.
Modify
The Configure and Reset icons. Reset only appears when the default 
settings have been modified. Selecting Reset restores the default settings.
Table 24: Actions to select for each predefined signature
Action
Description
Pass
The FortiGate unit lets the packet that triggered the signature pass 
through the firewall. If logging is disabled and action is set to Pass, the 
signature is effectively disabled.
Drop
The FortiGate unit drops the packet that triggered the signature. Fortinet 
recommends using an action other than Drop for TCP connection based 
attacks.
Reset
The FortiGate unit drops the packet that triggered the signature, sends a 
reset to both the client and the server, and removes the session from the 
FortiGate session table. Used for TCP connections only. If you set this 
action for non-TCP connection based attacks, the action will behave as 
Clear Session. If the Reset action is triggered before the TCP connection 
is fully established it acts as Clear Session.