Not long ago, the node in Mumbai, India was migrated to a new Datacenter.
At that time, IPv6 was not possible to be moved over.
I am in contact with the provider and trying to get IPv6 accessibility restored as soon as possible.
Updates will be posted here when I got them.
[UPDATE]
the failure was because a faulty ipv6 subnet was assigned.
Currently assigning new IPv6 to each VPS on the node.
Please check your settings as the new IPv6 should start with 2001:df3:8880:3:d227
Monday, August 16, 2021