• 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.

Resolved I can't open website after Plesk Obsidian 18.0.56 Update 1

Usually the error logs of the website contains more information on the cause of the error. Did you have a look at the error logs?
 
I am sorry. This is not the issue. You can close this ticket. The problem was in other place not plesk update.
 
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