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The newest fun part: with the latest update the network connections with enabled Firewall are stable, but if you backup your Mac with TimeMachine to a NAS device, the backup is no longer working. Stops between 200 and 400MB.
[Re-Titled by Moderator]
MacBook Pro 16″, macOS 15.0
Tl;dr. This tip also worked for me. Thanks!
Waiting fix from Apple.
Details:
I have Synology NAS and use Time Machine service (all device in same local network). It's working fine for years.
After successful update to Sonoma 15.0.1 i received error message:
The backup disk image was ejected or disconnected from your Mac while backing up.
I tried restart my devices. Also I checked wifi connection. All working fine, but backup not work.
After reading comment I just turn off firewall, and backup ended successfully.
I have the same setup as you. I had to reboot twice after the 15.1 update and I started a new backup (because I thought that the old one might be corrupted). I don't know if the new backup was required but the reboots certainly were. Everything seems to be working well now. Good Luck!
I did this already with 15.0 + 15.0.1 and that fixes it also temporary, but I came back after a while. Will try this as well with 15.1 but this shouldn't be the solution to remove the whole backup and start again.
Disabling the firewall worked for me. I think I recall it working once or twice without deactivating the firewall on 15.0.1.
Now after updating to 15.1, it seems to work reliably.
This is also backup to a Synology NAS.
summary: 15.1 fixes it for me.
15.0.0 and 15.0.1 broke Time Machine backups for me as described in this thread. disabling Apple firewall in network settings was the workaround.
15.1 fixes it. I no longer need to disable the Apple firewall for Time Machine backups to complete on my Symplogy NAS.
Software: Little Snitch Mini and Cloudflare Warp.
hardware: MacBook Air M3 and Synology DS220+ NAS.
So I can back up with Time Machine now I am on Os 15.1. But only triggering the back up manually. If it's on the normal hourly auto. setting, it looks fine but then reverts to the "server disconnected during the procedure" type error log. But at least I can now back up. Definitely not moving from Os14 for other devices.
That because it Disney at every Mac Upgrade each year! That’s why I consider Time Machine to to basic and myself went shareware backups that continue programs instead where it picks up older backup files!
Appears fixed in Sequoia 15.1 (definitely broken in 15.0.1). I am now able to turn my mac's firewall back on. There was also an update to Synology DSM 7.2.2-72806 I installed at about the same time. So between the two updates, it is now fixed.
This is what I'm trying. Downgrading back to 15.0 per support page. How to download and install macOS - Apple Support
These are my DNS settings with Cloudflare
Thanks, that's great, sent a message
Your Welcome
Had the same. I used the hosts file which was not the best idea. Switched to proper DNS server access to the NAS via SMB works again.
Not using hosts file or so. In my case also proper DNS. As said, before upgrade to 15.0.1 everything was working perfectly.
Weird, what's the nslookup output?
I updated DNS and then it was working fine, try that. Good approach: check you nslookup result in the terminal.
What causes TimeMachine backups to fail on NAS devices?
