IPv6 Reachability of cPanel Server Login Forms
Due to a cookie problem (some browsers/providers randomly switching from IPv6 to IPv4 and back or vice-versa within a short time period) that causes automatic logouts after a short period of time, we have decided to change the IPv6 login forms of our cPanel servers. You can reach the IPv6-only version by adding "six" to the prefix of your server, e. g.:
|IPv4-only hostname||IPv6-only hostname|
Currently this is the most practical solution to this problem, short of allowing unsecure session handling.