We are migrating from some 200's running 7.1.x code to 220's running 8.0.x code. We had a rule that was working fine, allowing any traffic from a server to another server. We didn't define any apps or tcp ports. We have that rule in the new firewall, but it is now being blocked as "unknown-tcp".
We added a rule allowing any traffic between the servers over the port they use. It still is blocking it as unknown-tcp.
Why did this work in 7.1 but not in 8.0? I've gone through the release notes and there is nothing about application ID changes that would effect this. Is an application override the only way to get this to work?
So it stopped working after upgrade?
Can you create new rule and instead of using address groups just add single ip to source and destination.
Those that you hid in your first screenshot.
To be sure that this source and destination are included in those groups.
There is a setting where you can disallow any unknown-tcp or unknown-udp traffic; let me see if I can find it.
edit: I can't seem to find it with a quick glance but I'm fairly certain that was/is a thing. In the meantime you could utilize an application-override policy to classify the traffic as another application, or a custom application, and it should match your existing rule.
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