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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.
Is there a safe way to change the default TCP port that Plesk uses? (I'll be demonstrating Plesk at a conference this weekend and the network at the venue blocks all ports except a handful of the Well-Known Ports.)
After reading the KB article, I am left with the impression that the short answer [for Linux administrators] is "no".
Parallels Plesk Panel must be accessible on default ports. Port 8443 is used by external management and provisioning systems (Parallels Automation, PBA-S, Customer & Business Manager)...
If you need to make Parallels Plesk Panel accessible on custom port, it is better to add binding to PleskControlPanel website in IIS...