Sites 000-ispconfig.vhost and 000-apps.vhost don't listen on ipv6 using nginix by default
Have not tested in apache, as my test server has nginx.
Editing the file manually and adding:
listen [::]:8080; # in 000-ispconfig.vhost
results in the service working properly - but this is not included by default. In the 000-apps.vhost file, the line is the same except port 8081 as follows:
listen [::]:8081; # in 000-apps.vhost