On Fri, 14 Oct 2016, Kurt Jaeger wrote: > www.corso-kino.de Thanks. If it helps, point them to this website (still in development/beta): https://ipv6alizer.se/ The result is (verifies what you said): INFO: server-mss 1440, result: pmtud-fail ERROR: http://www.corso-kino.de don't listen to PTB -- Mikael Abrahamsson email: swmike at swm.pp.se