Comment # 2 on bug 966999 from Dominique Leuenberger

(In reply to Achim Wirtz from comment #0)
> User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:44.0) Gecko/20100101
> Firefox/44.0
> Build Identifier: 
> 
> IPv6 Privacy Extensions don't work with NetworkManager in Leap 42.1

Where did you set it up? Using nm-connection-editor ?