Hi All ,
I am having policy having application group and set services as application default .
Sometime policy is working fine but sometime its dropping packet and in logs showing application unknown UDP.
Could you please suggest any troubleshooting steps here ? I did packet capture but not seeing any this specific which can indicate any issue on firewall end .
What type of traffic are you actually seeing this on? It wouldn't be uncommon to see something developed internally have an unknown-tcp/udp determination, but if it's traversing the untrust/internet interface that's different.
In any case, it usually means that the firewall either didn't pass enough traffic to identify the app-id, or an app-id simply doesn't exist for the traffic.
Interesting. I've never actually had the firewall fail to identify syslog traffic across the default 514 port, but I have if I customize the port without creating a custom application or doing an application-override see it come across as unknown-udp.
Personally, I would take a packet capture of the traffic when it comes across as unknown-udp and see if you can notice any sort of difference with the traffic. If you aren't seeing anything I would try to capture the traffic and open up a TAC case for review.
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