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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.
That's interesting, on every box I've done fresh RH9/Plesk 7.5x, there has always been an unauthorized.html file in the /home/httpd/vhosts/.skel/0/error_docs/ directory
I had two sites from one client. On both sites a directory needed password protection. One site it worked, the other not. So I checked the differences on the hosting setup page and found out that the working site had Custom error documents checked. And the site where it did'nt work had not. After checking the custom error documents field the protection worked right away.