• The new Python extension is now available. It allows customers to deploy and manage WSGI-based Python applications on their websites directly from Plesk.
  • 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.

Unusable Control Panel after upgrade

I don't know if it's revelant but sw-cp-server/error.log screams:

PHP Warning: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument; File: /opt/psa/admin/smb/application/library/Smb/Controller/Action/Admin.php, Line: 465

Exception: PHP Warning: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument; File: /opt/psa/admin/smb/application/library/Smb/Controller/Action/Admin.php, Line: 465

file: /opt/psa/admin/smb/application/library/Smb/Exception/Syntax.php
line: 55
code: 0
trace: #0 [internal function]: Smb_Exception_Syntax::handleError(2, 'json_encode() [...', '/opt/psa/admin/...', 465, Array)
#1 /opt/psa/admin/smb/application/library/Smb/Controller/Action/Admin.php(465): json_encode(Array)
#2 /opt/psa/admin/smb/application/library/Smb/Controller/Action/Admin.php(383): Smb_Controller_Action_Admin->_addSearchBarParams()
#3 /opt/psa/admin/smb/application/library/Smb/Controller/Action/Admin.php(102): Smb_Controller_Action_Admin->_addShortcutsSegment()
#4 /opt/psa/admin/plib/Zend/Controller/Action.php(133): Smb_Controller_Action_Admin->init()
#5 /opt/psa/admin/plib/Zend/Controller/Dispatcher/Standard.php(268): Zend_Controller_Action->__construct(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http), Array)
#6 /opt/psa/admin/plib/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#7 /opt/psa/admin/smb/application/library/Smb/Application/Web.php(48): Zend_Controller_Front->dispatch(NULL)
#8 /opt/psa/admin/smb/application/public/index.php(15): Smb_Application_Web->run()
#9 {main}
 
OK, found the problem - Polish Translation. Switching back to en_US fixes everything. Please proofread and fix this issue, something as trivial as swithing a language can make the whole panel inoperable.
 
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