[Resolved] Web Sites viewable from IPv4, but not iPv6 addresses (default page displayed)

[KevinM]

This IPv4 vs IPv6 stuff if beyond me. There are some sites on my Plesk 12 server that "can" be viewed from IPv6 devices without a problem and other sites display the default Apache page. All web sites "can be seen" from IPv4 addresses.

What Ive tried:

I've added the AAAA record with the IPv6 address to the domain that can't be seen. I have a feeling there is something missing within Plesk.

 

[KevinM]

It figured out that each domain needs to have its IPv6 address assigned to the domain to allow access. Still does not explain why some domains without this assignment worked.

Here is a screen shot of the IP panel on a domain.

http://i.imgur.com/OQShwH9.jpg

Version: Plesk v12.5.30_build1205150826.19 os_CentOS 7