Palo Alto Networks firewalls automatically
generate a packet capture for sessions that contain an application
that it cannot identify. Typically, the only applications that are
classified as unknown traffic—tcp, udp or non-syn-tcp—are commercially available
applications that do not yet have App-ID signatures, are internal
or custom applications on your network, or potential threats. You
can use these packet captures to gather more context related to
the unknown application or use the information to analyze the traffic
for potential threats. You can also Manage Custom or Unknown
Applications by controlling them through security policy
or by writing a custom application signature and creating a security
rule based on the custom signature. If the application is a commercial
application, you can submit the packet capture to Palo Alto Networks to
have an App-ID signature created.
Verify that unknown application packet capture
is enabled. This option is on by default.
To view the unknown application capture
setting, run the following CLI command:
running application setting | match “Unknown capture”
If the unknown capture setting option is
off, enable it:
application dump-unknown yes
Locate unknown application by filtering the traffic logs.
the filters as shown in the following example.
Click the packet capture icon
to view the packet capture