• 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.

Issue error 500 Session_Exception login to Plesk

The locale which had been previously chosen as a default was unregistered from the Plesk database during a Plesk upgrade.
Try to fix it with the following steps:
  1. Set the locale en-US as default:
    Code:
    # plesk bin server_pref --set-default -locale en-US
    # plesk bin admin -u -locale en-US
  2. Reinstall Plesk updates:
    Code:
    # plesk installer update --repatch
  3. Log in to Plesk and set a required locale at Tools & Settings > Languages.
 
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