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Issue IPv6 configuration lost across the entire server, reinstallation of IPv6 fails

W4ru

Basic Pleskian
Server operating system version
Ubuntu 22.04.5 LTS
Plesk version and microupdate number
Plesk Obsidian 18.0.72 Update 3
Hello!
I have read a lot here and on the web, but I am not getting anywhere.

Brief summary:
I have two separate monitors for ipv4 and ipv6 in platform360.io. On Tuesday, I received a notification that ipv6 was not accessible. I ignored it, but yesterday it became clear that the entire ipv6 integration on the server was no longer working.

I tested many suggestions and ultimately removed the IPv6 addresses used everywhere, including deleting the IPv6 from the server itself (V-Server at Ionos). Restarts.

Then I reassigned IPv6 in the Ionos backend, reintegrated it in Plesk (it was recognized correctly), ran Troubleshooter and plesk repair --web.

After all these steps, the status remains that the websites are not being delivered via ipv6, but also that a “ping6 google.de” is not being resolved from the server.

I have no idea what else I could do.
I am thankful for any advice and would be pleased to send details of the configuration or log file.
 
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