I've got a rule that allows the following applications from any source in our trusted zone out to any destination in the untrust zone.
The rule is set for application-default.
We have some legitimate traffic on our network that goes from trust to untrust with the destination port of tcp/37.
For some reason, this traffic is matching up to this rule. None of the applications in the rule list tcp/37 as a default port. Only two of those applications (skype and net.tcp) have dynamic default ports.
When the tcp/37 traffic hits this rule, the application always shows up as "insufficient-data"
I know what the traffic is - it is supposed to be the old "TIME" protocol. I've actually created a rule specific for this further down the list.
Any idea why the traffic would match up to this rule?
Whenever you have a rule allowing application-default the firewall is going to allow enough traffic to identify the application. So the rule that this traffic is hitting is, if I would have to make an educated guess, the first entry in your security rulebase from trust to untrust that is based off of app-id.
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