Plesk Service/Interface

This section contains articles about failed Plesk interface actions and broken Plesk service.

What is Performance Booster on domain page in Plesk?
Domain shows 403 Forbidden error after using Move Domain feature: You don't have permission to access / on this server
Vulnerability CVE-2020-27511
How to change the main IP of Plesk?
Site Preview button leads to "Error: Invalid URL was requested." being showed in Plesk UI
Warning when updating Service Plan: There are settings that conflict with the server-wide security policy: PHP Handler Type
After Plesk update 18.0.55 is applied, Customers using a Service Plan can no longer manage SSL/TLS Support settings for their Subscriptions, because they are grayed out
Plesk GUI login page is blank on a Windows Plesk server
Plesk GUI returns Error 500: /var/www/vhosts is out of webspace
Plesk is GUI not accessible after update from Onyx to Obsidian: ERROR: Type of GraphQL\Language\AST\ScalarTypeDefinitionNode::$kind must not be defined
Plesk Performance Booster displays the warning: Following permissions are not allowed in the subscription, or service plan: PHP version and handler management
Plesk Performance Booster displays the warning: Following permissions are not allowed in the subscription, or service plan: Common PHP settings management
Plesk Performance Booster displays the warning: Following permissions are not allowed in the subscription, or service plan: Hosting settings management
Dynamic list layout is broken after Plesk update to 18.0.55
Unable to access domain's Files page in Plesk: cannot read properties of undefined (reading 'state')
Unable to access domain page in Plesk GUI: Unable to find service node for ip address with id
Plesk interface is not accessible with a 500 Internal Server error: Handler "PleskEngine-FastCGI-php" has a bad module "FastCgiModule" in its module list
Plesk intermittently provides error when opening different pages: Syntax Error: Unexpected token '<' "<!DOCTYPE> " is not valid JSON
How to use the website preview function in Plesk for website testing?
How to raise the pm.max_children setting for an entire Service Plan in Plesk?
Is there support for AVIF image files in Plesk?
Unable to access domain hosting settings from Reseller login and dynamic view in Plesk for Windows
Plesk is not accessible due to "Permission denied" error: Lock Manager error: Can't open or create shared memory by shm.name
Plesk for Windows is not accessible with the 503 error: The Module DLL C:\Windows\Microsoft.NET\Framework64\HttpResetModule.dll failed to load
Unable to remove a customer in Plesk: Unable to load object of type Mailname with id
Unable to create or edit user roles: ERROR 500 Zend_Form_Exception: Element name must be a string
Unable to access Webmail service on a Plesk server; the following error is shown on the web browser: 500 Internal Error
Error when removing an IP address without assigned domains in Plesk: The IP address is already used for hosting
Some actions fail in Plesk: "Cannot connect to the task manager" or "Unexpected non-whitespace character after JSON"
Plesk mail antivirus settings show a blank page: Unable to find row by field name with value premium-av