Hello, this is widely discussed in the ubiquity Forum [1] because it breakes the UniFi Controller.
Consensus seems to be that the kernel upgrade with the fix for CVE-2017-1000364 caused the issue. Strech seems to be affected as well. Cheers, Martin [1] https://community.ubnt.com/t5/UniFi-Wireless/Unifi-Controller-on-Debian-9/td-p/1967180
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