Providers of third-party firewalls, i.e. Network Filters for macOS, at the same time warn against using Apple Firewall under Sequoia. a bug in apple networkextension framework This ensures that data is forwarded to third-party apps untrusted. This makes using a tool like Little Snitch a game of chance.
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Firewall plus firewall equals bug
The app’s creator, Objective Development from Vienna, is also currently warning before the problemThe bug is still present in macOS 15.1, which is believed to have cleared up network-related errors reported by various security companies. While difficulties regarding DNS queries no longer occur – among other things, UDP packets were dropped, which led to name server errors when using the app firewall – the firewall problem is apparently new or at least only now Is being more widely understood.
“As a result of this new bug, Little Snitch cannot receive information about network traffic from Apple’s framework, resulting in no traffic being seen in Network Monitor, connection warnings not being displayed,” Objective Development said. , and firewall rules blocking the connection are not being enforced.” , Since this happens only sporadically, users no longer have any overview of what is happening on their systems.
Network activity no longer occurs
Therefore the manufacturer warns against running both Apple’s integrated firewall (via Network Settings) and Little Snitch at the same time. Since Apple Firewall likes to be active by default, you’ll need to turn it off. In addition to Little Snitch, Little Snitch Mini is also affected. “The problem occurs relatively rarely, so it cannot be reliably reproduced,” Little Snitch developer Norbert Heger told Mac&I. “But when this happens, it is in such a way that Little Snitch or Little Snitch Mini no longer shows any network activity.”
As soon as you turn off the macOS firewall, the data comes back immediately, “When you turn it on again, radio silence immediately comes back.” Apple has not yet commented on the matter. Sometimes restarting the Mac helps, but later the error occurs again.
(B.Sc.)
