• Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be 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.

Default Page shows without www prefix. (as naked website)

Have you tried to reconfigure this vhosts with "%plesk_bin%"\websrvmng.exe CLI utility?
 
this is the bug for 11.5 we already created thread for it cant get any reply or fix. You can be sure this is urgent for us as well.
 
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