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Q: Writing to NAS disconnects NAS in macOS Sierra

Hey folks, I'm asking for help with this pretty weird and annoying thing:

 

Since upgrading to macOS Sierra 2 of my 6 MacBook Pros loose connection to a network NAS when trying to open or save documents (e.g. Excel 365, Pages 6.0). No proper error message appears except this one (in German)Bildschirmfoto 2016-10-05 um 12.17.47.png

essentially stating that the server is being switched off. After that, I have to reconnect to the server. But the issue keeps coming back and is also active after booting in safe-mode. I once downgraded back to El Capitan which eliminated the problem. After a weeks or so I wanted to try Sierra again but as you see the issue is still active. Again, the issue only appears on 2 out of 6 MacBook Pros (all within the same local network), all of which have been updated at the same time from El Capitan to Sierra. Since the NAS serves the other 4 Macs well, and the 2 having issues under Sierra work well running El Capitan. So I suspect an Sierra/machine specific issue. Any help is very welcome!

 

The 2 struggling MacBook Pro models:

(1) 15-inch Retina (Late 2013), 2 GHz i7, 8 GB 1600 MHz

(2) 15-inch (Mid 2012), 2.6 GHz i7, 8 GB 1600 MHz

MacBook Pro (15-inch Mid 2012), macOS Sierra (10.12), 15-inch Retina (Late 2013)

Posted on Oct 5, 2016 4:24 AM

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Q: Writing to NAS disconnects NAS in macOS Sierra

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