On a Plesk for Linux server, dynamic IPv6 address is added to one of the server's network interfaces:
# ip a | grep inet6
inet6 ::1/128 scope host
inet6 2001:db8:f61:a1ff:0:0:0:80/64 scope global mngtmpaddr dynamic
inet6 fe80::f03c:92ff:fe12:e46e/64 scope link
After clicking Reread IP in Plesk in Tools & Settings > IP Addresses, the added IPv6 address is not shown OR the below message is shown under it:
This IP address is not configured properly.
Manually adding that IPv6 address in Tools & Settings > IP Addresses > Add IP Address fails with the error:
Error: ifmng failed: Execution of /sbin/ip addr add 2001:db8:f61:a1ff:0:0:0:80 dev eth0 failed with return code 2. Stderr is RTNETLINK answers: File exists
Subscriptions assigned to the IPv6 address can have a red exclamation mark next to them. When hovering the icon with the exclamation mark the following information is displayed:
Some of the domain IP addresses are inoperable and excluded from server configuration. Check domain IP bindings and update if needed.
A dynamic IPv6 address is used.
Until Plesk Obsidian 18.0.27, Plesk for Linux does not support dynamic IPv6 addresses.
Note: Plesk for Windows supports dynamic IPv6 addresses.