I'm having an odd issue, and I wonder whether anyone else has seen anything like this.
I have a headless Mac mini1, named "cooper" for reasons that should be obvious. The mini lives in a cupboard (not under the stairs), and its main job is to run iTunes and feed the AppleTV, as well as any other long-duration tasks. It also occasionally acts as a test bed for my projects, but those have been few and far between lately. Surprise! It turns out that having kids takes up a bunch of time that would otherwise be available for projects, and once they're in bed I'm usually too shattered to do anything very serious.
Because it's headless, the main way I interact with it is via Share Screen from my MacBook Air. The problem is that the mini occasionally loses the ability to advertise itself as a Shared device in the Finder sidebar.
In this screenshot, I only see the NAS. There should be another entry above that, like so:
The thing is, the mini is still reachable via VNC - just not from the Finder, because the Finder in its wisdom only allows you to Share Screen from a machine that is visible under Shared. Using the "Connect to" menu action, or for that matter iSSH on the iPad, however, I can still VNC in and see that everything is running fine.
The only fix to this issue that I have found is to reboot the mini. Since I can get in both via VNC and via SSH, this isn't a huge issue, because I can shut things down and make it a clean reboot, but it's still annoying. I haven't been able to figure out a cause, either; sometimes it happens while I'm connected via Share Screen if the Air goes to sleep, while at other times it happens if the mini is asleep - it wakes up but doesn't advertise itself in the Finder sidebar.
Both the Air and the mini are running Yosemite. Any suggestions?
UPDATE: Ars Technica did publish a deeper investigation than I got into. It seems that the root of the problem is indeed in discovery, as I had surmised. With Yosemite, Apple switched from
discoveryd, and it looks like the latter has some issues.
That said, the Ars suggestion of restoring
mDNSResponder seems insane to me. I guess I will just muddle through until Apple fixes
Yes, that is the correct capitalisation, TYVM. ↩