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Issue IPV6 issue after yum update CentOS 7.9

Deagan

New Pleskian
Server operating system version
CentOS Linux 7.9.2009 (Core)
Plesk version and microupdate number
Plesk Obsidian v18.0.55_build1800230919.07 os_CentOS 7
Hello,

After updating our CentOS 7.9 servers running Plesk, we lost all ipv6 connectivity. We cannot ping6 out or in. The servers run on a Virtuozzo 7.5 server as a container.

No settings have been changed, I've already checked all settings I could find ( forwarding, accept_ra, added/removed ipv6 ip from container, added new route to ipv6 gw in container, restarted network in container etc. ). From the host node I can ping6 outside and in.

Anyone else experiencing ipv6 issues after running yum update? We also had the curl/no resolve possible from php curl issue descriped in this thread after the yum update.
Any help would be really appreciated.

I cannot figure out the problem, spend many hours already, I hope someone can help.
 
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