CWP doesn't support IPv6, but Apache 2.4 does.
BUT Requires manual configuration.
We use IPv4 & IPv6.
BUT with IPv6, you have to manually add it to the VHOST .conf file
Here's an example.
Goto WebServer Settings -> WebServers Conf Editor -> Tab labeled [/usr/local/apache/conf.d/vhosts/], Select the .conf you want to add IPv6 to.
At the very top you will see: <VirtualHost 1.2.3.4:80>
Simply at the top, add the IPv6, so it looks like: <VirtualHost 1.2.3.4:80 [Your IPv6]:80>
You will need to do this with both files. .conf & .ssl.conf.
But with ssl, you will have the port set to 443.
Now you have to lock the .conf files, so when CWP run it's updated it won't wipe out your config.
You can also create a template for each site, but that always seemed like a pain in the @$$.
To lock the files run:
cd /usr/local/apache/conf.d/vhosts/
chattr +i *.conf
To unlock run:
cd /usr/local/apache/conf.d/vhosts/
chattr -i *.conf
If you got lost, then you might want to hire an experienced sys admin.