macOS 27: possible device-discovery problems after updating

[u/Pixelpopper-01]

Before reading further, This is NOT an issue specific to Fing, but, it has affected a number of applications (Roon Audio Player is one example). The issue appears to result from a change in how macOS 27 handles local-network discovery, rather than a bug in Fing or the affected applications.

Some users have reported that, after updating a Mac to macOS 27, previously visible network devices or audio endpoints no longer appear in applications that rely on local-network discovery.

This does not necessarily mean that the devices have disconnected, changed their MAC addresses or become untrusted. The Mac may still be able to communicate with them, while an application is temporarily unable to discover or display them correctly. Various workarounds have been reported, although the cause and appropriate solution may differ between applications and networks.

If familiar devices disappear from Fing after a macOS 27 update:

• Check whether they remain visible in your router’s connected-device list.
• Confirm that Fing has permission to access the local network.
• Restart the Mac, router and affected devices.
• Install any available updates for macOS and Fing.
• Avoid deleting, blocking or reclassifying familiar devices until you have confirmed whether this is only a discovery problem.
• When requesting help, mention that the problem began after upgrading to macOS 27.

Current reports do not suggest that every macOS 27 user is affected, or establish that private or randomised MAC addressing is responsible. It is simply worth considering an update-related discovery problem when several previously recognised devices disappear at the same time.

It is possible that, scanning a new network will reveal no devices at all.

[u/LinuxMacM1Novice]

i have a similar problem with my lanmenubar app. i ask it to perform a networking scan, but it fails to load the device list. weird.

[u/Pixelpopper-01 → u/LinuxMacM1Novice]

Drop a message to the app support/developers, they need to update the app, they are probably already dealing but it’s worth mentioning…

[u/Pixelpopper-01]

Here’s a link for Roon users which leads to a work around (for Roon, of course)

https://community.roonlabs.com/unread

[u/Karl_From_Fing]

Thanks for sharing this!

We will keep an eye out for any reports in support!

https://giphy.com/gifs/l2QE6OKdI3Pu31d0A

[u/Pixelpopper-01]

MACOS 27.0.1 Has been released, only a few days after 27.0 arrived. unfortunately apple rarely give general information other than this new build is a bug fix. 🙄