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Debian 11 has reached its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.81 is the last release to support it.
If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.
no, that doesn't matter. You could as well use the new "Let's encrypt" extension, which makes it pretty easy to get certificates free of charge to reach your goal.
even that it is "experimental", it works as expected and without any issues ( I use it now for 2 month now on different production servers, with quite a lot of domains and subdomains ).
for commercial options if you buy a cheap one, yes you gone need to buy 2 ssl.
there is another version that enable you to protec domain and sub as i remember they call Wildcards ssl.
frequently is more cheap to buy 2 ssl than one wildcard.