First select Objects > Security Profiles and then modify the desired profile as described in the following table:
Select a custom Anti-Spyware profile, click the DNS Signatures tab and, in the Packet Capture drop-down, select single-packet or extended-capture. Select a custom Vulnerability Protection profile and, in the Rules tab, click Add to add a new rule or select an existing rule. Then select the Packet Capture drop-down and select single-packet or extended-capture.
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In Anti-Spyware and Vulnerability Protection profiles, you can also enable packet capture on exceptions. Click the Exceptions tab and in the Packet Capture column for a signature, click the drop-down and select single-packet or extended-capture.(Optional) To define the length of a threat packet capture based on the number of packets captured (which is based on a global setting), select Device > Setup > Content-ID and, in the Content-ID™ Settings section, modify the Extended Packet Capture Length (packets) field (range is 1-50; default is 5).After you enable packet capture on a security profile, you need to verify that the profile is part of a security rule. For information on how to add a security profile to a security rule, see Security Policy Overview.Each time the firewall detects a threat when packet capture is enabled on the security profile, you can download () or export the packet capture.