"Failed to resolve the IPv6 localhost address ::1. Please verify an entry for the IPv6 localhost address exists in your /etc/hosts file. * : Failed with error(s) "

I am getting below error in various clients from last week and all the backups failing.can someone answer on this?seems like known issue.

"Failed to resolve the IPv6 localhost address ::1. Please verify an entry for the IPv6 localhost address exists in your /etc/hosts file. * : Failed with error(s) "

IPV6 not enabled in any of the clients.

-Navneedhan