Hello Tony,   
      
   On Wednesday August 15 2018 08:06, you wrote to me:   
      
    MvV>> The rest is blocked. It may be too strict for RFC4890, but is is   
    MvV>> good enough for http://ipv6-test.com.   
      
    TL> I temporarily turned Windows Firewall off, no change. :(   
      
   So it is your router that is the problem?   
      
   Cheers, Michiel   
      
   --- GoldED+/W32-MSVC 1.1.5-b20130111   
    * Origin: Michiel's laptop (2:280/5555.1)