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
To be clear, it is not the apple OS firewall that was the problem for me. it was the external firewall (mcAfee, Sophos, etc). For me, I updated my Sophos firewall to the latest version and the problem went away. Sophos had a blurb about this on their support site. try updating your external firewall (not the definitions but the actual program) and see if that fixes it for you. I am now using 15.0.1 TimeMachine with no issues. Have done 5 backups perfectly.
+1
Temporarily disabling the firewall and initiating the backup manually seems to be the only reliable workaround.
Issue is fixed on 15.1, backups from TimeMachine now copy to NAS without any alterations to the settings from 14.7.
Thanks, turning off firewall finally got time machine to work again. Hopefully they fix this.
Hi
What worked for me is to set the Synology configuration as described here https://kb.synology.com/en-global/DSM/tutorial/Time_Machine_backup_failed.
On macOS system preferences I activated Windows file sharing. Now Time Machine Backup works fine.
Update 29th Oct: After updating to macOS 15.1, I'm able to backup to my NAS with Time Machine without issues (with Lulu and firewall enabled).
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.
Upgrade to 15.1.1 as 15.0.1 is known to be bad.
What worked for me. FYI: I'm using a WD MyCloud device - I know...it's old, but it still works. And M1 Max. Sequoia 15.1.1.
What I tried:
Disabling firewall
Resetting SMB connections
Removing and re-adding Time Machine drive (my WD MyCloud device) and using existing backup.
What worked:
Removing and re-adding Time Machine drive (my WD MyCloud device) and creating a new backup.
Good news : upgrading to macOS 15.2 fixed the issue for me.
I could re-enable the firewall and the Time Machine backup did not fail as it did before.
Just spent an hour+ with apple support. had me boot into safe mode, shut down my firewall and the backup worked! Obviously still an issue but at least I got a backup to my NAS. after it's finished I will reinstall the operating system, turn the firewall on and try again. stay tuned...
My physical FW is independent of Mac OS - it's a physical device. It's still the same issue in Sequoia 15.0.1 -> turning on Mac OS firewall breaks TimeMachine backup to a NAS. It's really horrible.
I always rely on a two-stage FW: physical device and Mac OS, never trust a single source. I currently just need to remember to turn on Mac OS FW starting a business trip to be safe in hotels and public networks.
Fixed in 15.1 (at least on my system) with the Firewall on. Yay!
It not just non Apple firewalls. It the internal one in MacOS as well. I turned it off and the backup runs. Turned it back on and it doesn’t.
In MacOS 15.1 is more broken in Time Machine for use with NAS
When removing and adding back the NAS to the Time Machine devices:
Currently only backups to external hard drive continue to work.
Error message: "The network disk disconnected from your Mac while backing up"
I found a solution for me and Time Machine backups are now working. I had to remove my Time Machine target in the System Settings and had to reset the broadcast setting on the NAS:
After that Time Machine found the Time Machine target again and I could re-attach to the backup and continue. Now Time Machine works again.
What causes TimeMachine backups to fail on NAS devices?
