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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.
Look at the earlier thread about 7.5.3 horde problems. I followed the advice there (including the 5.0 loader), restarted the plesk services and it cured the horde problem (and problems with other php-dependent websites).
I'm not sure why (or if?) horde requires ioncube. Somebody else may have more information on that.
Actually, until about this time yesterday, I thought an ioncube was something used to sweeten inter-galactic coffee
I tried this in several steps, but things started working after I installed the updated ioncube loaders and then pointed the ini files to the 5.0 loaders.
The ioncube loaders were referenced in 2 ini files and in 2 locations on my server. I updated both ini files and placed the updated loaders in both locations.
I restarted plesk services using psa stopall then psa start.