Resources, Articles, Tricks, and Solutions in connection to Plesk

Plesk error pool seems busy - Fix it Now ?

This article covers methods to resolve Plesk error pool seems busy. This error happens when the PHP-FPM pm.max_children has been reached by the website(s). 


To Increasing pm.max_children for one domain via a command-line interface:

1. Create a php.ini file in domain's system directory /var/www/vhosts/system/example.com/conf/:

$ touch /var/www/vhosts/system/example.com/conf/php.ini

2. Open the php.ini file in any text editor (for example, vi editor) and add the following records:

[php-fpm-pool-settings]
pm.max_children = 20

3. Save the changes and close the file.

4. Run the following command to apply the changes:

/usr/local/psa/bin/php_settings -u

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Plesk error AH01075: Error dispatching request to - Fix it Now ?

This article covers methods to resolve 504 Gateway Time-out Plesk error which happens when there is an Execution of the PHP code of the website which takes longer than the specified timeout.

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Postfix address already in use Plesk error - Fix it Now ?

This article covers methods to resolve Postfix address already in use error in Plesk. To fix this error, simply Edit file /etc/postfix/master.cf and comment out all duplicate lines in the configuration, for example:

203.0.113.2- unix - n n - - smtp -o smtp_bind_address=203.0.113.2 -o
smtp_bind_address6= -o smtp_address_preference=ipv4

Note: The line with the IP address should exist only once in the /etc/postfix/master.cf configuration file.

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Roundcube SMTP Error (454) Authentication Failed - Fix it Now ?

This article covers how to fix Roundcube 'SMTP error (454) authentication failed' issue for our customers. 

To fix this SMTP error:

via Command Line Interface (CLI):

1. Connect to the server via SSH;

2. Execute the following commands:

plesk installer --select-release-current --install-component qmail
# plesk installer --select-release-current --install-component postfix

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WHMCS error code 1013 - Fix it Now ?

This article covers WHMCS error code 1013. Basically, this error happens when the external_id entry is missing in psa.clients MySQL table. If the issue appears on WHMCS integrated with Plesk Multi Server, this database update should be done on the management node side.

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Database import hangs in Plesk - Fix it Now ?

This article covers methods to resolve Database importing hangs in Plesk with error reading communication packets. Generally, the database import task in Plesk fails due to non-optimized client databases.

The solution to this Plesk error is to simply optimize the databases.

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Plesk error FPM initialization failed - Fix it Now ?

This article covers methods to fix Plesk error, FPM initialization failed.

Basically, the error "FPM initialization failed" triggers in Plesk mainly in different formats. The is as a result of Incorrect PHP configuration file was generated during subdomain creation via XML API.


To fix this Plesk error:

i. Log in to Plesk server via SSH.

ii. Remove the excessive configuration file:

rm -f  /etc/php-fpm.d/subdomain.example.com.conf

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The plesk-php7x-fpm service crashes during the reload after domain name change - Fix it Now ?

This article covers how to resolve Plesk error, The plesk-php7x-fpm service crashes during the reload after domain name change. 


To fix this error, you need to update Plesk via a command-line interface:

1. Connect to a Plesk server via SSH (Linux) / RDP (Windows Server).

2. Run Plesk Installer Update (on Windows Server, start a command prompt as an Administrator):

plesk installer update

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Plesk error Unable to import the dump - Fix it Now ?

This article covers methods to fix database error in Plesk. 


To fix this Plesk database issue:

1. Start by Checking the version of your SQL server with:

# plesk db -Ne "select version()"

2. Make sure that collation mentioned in the error message is not available in MySQL server:

# plesk db -e "show collation" | grep uft8_general_ci

3. So you have to upgrade MariaDB to version 10.1 or 10.2 on the destination server.


How to upgrade Plesk MySQL 5.5 to 5.6/5.7 or MariaDB 5.5 to 10.X on Linux?

By default, Ubuntu 20.04 is shipped with MariaDB 10.3.

1. For security reasons, create a database dump of all databases with the following command:

MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysqldump -u admin --verbose --all-databases --routines --triggers > /tmp/all-databases.sql

2. Stop MariaDB:

$ service mariadb stop

3. Install repositories from Setting up MariaDB Repositories page:

# apt-get install software-properties-common
# apt-key adv --fetch-keys 'https://mariadb.org/mariadb_release_signing_key.asc'
# add-apt-repository 'deb [arch=amd64,arm64,ppc64el] https://mirror.truenetwork.ru/mariadb/repo/10.4/ubuntu focal main'

4. Create a backup of all MySQL data:

$ cp -v -a /var/lib/mysql/ /var/lib/mysql_backup

5. Start an upgrade with the following command. Leave all fields empty when asked for a 'root' user password:

$ apt-get update
$ apt-get install mariadb-server

6. Start the MariaDB service:

# service mariadb start

7. Upgrade MySQL databases:

MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysql_upgrade -uadmin

8. Restart mysql service:

$ service mariadb restart

9. Execute the following commands to update package version inside Plesk:

# plesk bin service_node --update local
# plesk sbin packagemng -sdf

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Internal error Account getPassword cannot decrypt password to be plain - Fix this Plesk error Now

This article covers how to resolve Plesk error, 'Internal error: [Account :: getPassword] cannot decrypt password to be plain'. It happens when A database user whose password is encrypted can now import and export the domain database after providing the database password.

However this issue is resolved in Plesk Obsidian.


To fix this Plesk error:

1. Updating Plesk via the Plesk interface

Make sure that port 8447 is opened in a firewall. If it is closed and cannot be opened for some reason, use the command-line instructions.

i. In Plesk, go to Tools & Settings and click Updates and Upgrades.

ii. On the Updates and Upgrades page, click Update Components.

iii. Click Continue to begin the update procedure.

2. Updating Plesk via a command-line interface

i. Connect to a Plesk server via SSH (Linux) / RDP (Windows Server).

ii. Run Plesk Installer Update (on Windows Server, start a command prompt as an Administrator):

plesk installer update


By default, Plesk installs updates automatically by means of the Plesk daily task (executed every night), if the option Automatically install Plesk updates is enabled at Tools & Settings > Update Settings.

During the update process:

1. Plesk may go offline for several minutes, if updates require a Plesk restart

2. Websites will stay online

Note: If a service component is going to be updated, its service will be restarted.


To find out what Plesk update is currently installed on the system, go to the Home page > System Overview.

Alternatively, execute the following command in a command-line interface:

plesk version

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mchk plesk How to use it

This article will guide you on mchk utility in #Plesk and how to use it to fix errors. It helps to repair malfunctioning Plesk services.

By using Plesk Reconfigurator, you can check and #repair Plesk installation that is malfunctioning due to misconfiguration of one or more of its components.

The following problems can be identified and corrected by using the Repair Plesk Installation option:

1. problems with mail delivery caused by user-made changes in DNS server addresses.

2. misconfigurations of system user accounts or groups used by Plesk to access system objects.

3. malfunction of Plesk's services.

4. misconfigurations in user access permissions for files and folders on server disks and hosting folders.

5. miscalculations of disk space usage by individual domains and subdomains.

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Plesk error Unable to update Web Statistics

This guide will help you to resolve #Plesk #error Unable to update #Web #Statistics. We can update web statistics urgently without even waiting for 24 hours by executing a command in the #command prompt.

The web-statistics calculation in Plesk does not work: The values at #Tools & #Settings > Traffic Usage by Domains (under Statistics) are not updated.

When manually recalculating the statistics for a domain, the operation fails with the following error message:

/usr/local/psa/admin/sbin/statistics --calculate-one --domain-name=example.com

WARNING during statistics_collector execution: : statistics_collector: Unable to parse pending domains traffic line: ?:: 2014-10-2 smtp 0

System error 11: Resource temporarily unavailable 

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Plesk DNN install Service Unavailable error

This article will guide you on how to install DNN for our customers. In order to fix the Service Unavailable Error we should check whether the Dedicated application pool option is enabled in Plesk before DNN install.

A 503 Service Unavailable Error is an HTTP response status code indicating that a server is temporarily unable to handle the request. This may be due to the server being overloaded or down for maintenance.

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Plesk Domain forwarding Setting it up

This article will guide you on the process to configure #Domain #forwarding in #Plesk which allows forwarding one domain to another domain and helps website owners who want to move their websites without losing traffic. We also discussed Plesk domain forwarding related #errors.

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solve Plesk Error Failed to retrieve directory listing

Plesk Failed to retrieve directory listing error is usually trigerred when ProFTPd passive mode is not configured on the server.  We found a solution for you.

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