Technical Questions
Help articles related to Plesk migration, upgrades, databases ant etc.
Other
- TTFB for site in Plesk is too high. What can be done to improve it?
- How to get/reset lost Plesk Administrator password in Plesk for Linux
- Plesk websites secured by Let's Encrypt certificates show ERR_CERT_AUTHORITY_INVALID warning after September 30, 2021
- The rule DHCP Client appeared in the Plesk Firewall, why?
- Plesk and websites are unavailable
- System logs on a Plesk server are not populating when the rsyslog package is not installed
Plesk Service/Interface
- Plesk Update Manager fails on the RHEL-based OS of version 8.5: 'NoneType' object has no attribute 'run_sack'
- How to hide/change the link "What username and password to use?" on the Plesk login page
- How to change the default state of the sidebar to be opened in Plesk 18.0.39 interface
- Plesk migration or the "plesk repair web" command fails: PHP Fatal error: Uncaught Error: Class 'GuzzleHttp\Promise\Create' not found in functions.php
- Unable to change the type of an IP address in Plesk for Windows Server: Cannot connect to the task manager (plesk-task-manager service might not be running)
- In Power User View, Plesk File Manager shows contents of last created/switched to webspace by default
Webserver
- Websites on PHP-FPM are unavailable or loading slowly: "server reached max_children setting" OR "pool seems busy"
- All sites are down in Plesk: Syntax error on line 31 of /etc/httpd/conf.d/php.conf: Invalid command 'php_value'
- CVE-2021-21703: Vulnerability in PHP-FPM
- Website on Plesk server suddenly started to show 500 error: AH10292: Invalid proxy UDS filename
- Websites hosted in Plesk are down after an update or reboot of the server: ERR_CONNECTION_REFUSED
- Websites on PHP 7.4 and PHP 8.0 are inaccessible on CloudLinux OS: 504 Gateway Time-out
Applications & Extensions
- Why the OUTPUT DROP rule is added at the beginning of the rules via Plesk Firewall extension?
- It is not possible to access SSH terminal extension via root user in Plesk: ssh_exchange_identification: read: Connection reset by peer
- Let's Encrypt 2.13.6 overwrites existing certificate to secure Plesk interface
- Google Drive Backup extension fails to open in Plesk: Call to undefined function GuzzleHttp\_idn_uri_convert()
- Unable to open "Manage in SpamFilter Panel" in SpamExperts Email Security after Let's Encrypt update to 2.13.5-734 version
- Adding a Git repository in Plesk shows error: Class 'CommonPanel_Validate_IpAddress' not found (GitUrl.php:44)
Backup, Restore & Migration
- How to switch to the new tokens scheme after Dropbox Backup update?
- Migration fails with mixed case domains on the source server: exit code: 23
- Does Plesk support Amazon S3 compatible Backblaze B2 storage?
- Pre-migration warning when migrating from server with custom Apache modules: The following Apache modules are not installed
- Migration from 18.0.36 to 18.0.36 fails with error: backup.tar" failed: No such file or directory (2)
- Plesk Pre-Migration check shows warning: Web server settings. Not all data may be migrated
Databases
- How to upgrade MySQL 5.5 to 5.6/5.7 or MariaDB 5.5 to 10.x on Linux?
- How to fix InnoDB corruption cases for the MySQL databases on Plesk for Linux?
- Unable to restore the Plesk psa database: ERROR 1813 (HY000) at line 104: Tablespace for table '`psa`.`tablename`' exists. Please DISCARD the tablespace before IMPORT
- Unable to delete MS SQL database in Plesk: User does not have permission to alter database, the database does not exist, or the database is not in a state that allows access checks
- Unable to export MySQL dump for a domain in Plesk: insufficient privileges to SHOW CREATE
- Unable to access Plesk with 500 error message: [2002] No such file or directory
Installation & Upgrade
- How to uninstall Plesk
- List of OS supported by Plesk
- Unable to access Plesk Installer page from an Apple device: Your connection is not private
- Does Plesk support Debian 11?
- Error during Plesk upgrade to Obsidian 18.0.37: PHP Fatal error: Uncaught JMS\Serializer\Exception\RuntimeException: Could not decode JSON, syntax error - malformed JSON.
- Issues upgrading or after converting CentOS 8 to AlmaLinux: none of the providers can be installed
- Excessive SRS header is displayed in From field in mail clients for some forwarded emails
- Mail user can't change its own forwarding in Plesk
- Emails can not be received/sent on a Plesk server due to stopped MailEnable SMTP Connector service
- [BUG] After updating to Plesk Obsidian 18.0.37 or 18.0.37 Update 1, email message sent to Plesk email account without mailbox and with forwarding to external mailbox is stuck in mail queue
- Mail client provides warnings regarding IMAP connection for Plesk mailboxes: inotify initialization error
- Unable to change mailbox size for subscription: Unable to set the required resource usage limit because the new value is less than the amount of resources reserved for your customers
DNS & Statistics
- Domains hosted on Plesk server cannot be accessed: DNSPROBE FINISHED ERROR
- Unable to update web-statistics in Plesk: Unable to parse pending domains traffic line
- Mail is received: No valid IP addresses found for sub.example.com
- Does Plesk support DANE and TLSA?
- DNS zone of newly created subdomain is not syncronized with DigitalOcean via extension
- Website hosted in Plesk shows Web Server's Default Page: Domain is resolved to the wrong IP address from the same server.
Website Builder
- How to install Web Presence Builder 17.8.12 Standalone in Plesk for CentOS 8/Debian 10?
- Migration from WPB 12.0 to WPB 17.8.12
- How to enable Web Presence Builder for all websites?
- Web Presence Builder "Text & Images" module is displayed on all website pages instead of being displayed only on the page where the module had been added
- Error while accessing Web Presence Builder: Base table or view not found
- Unable to backup/restore a snapshot for Web Presence Builder in Plesk for Windows: Invalid Snapshot