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Parallels Plesk Panel for Linux: Migration Best Practices and Use Cases

  • Parallels Plesk 11.0 for Linux
  • Parallels Plesk 11.5 for Linux
  • Parallels Plesk 11.0 for Windows


This article provides best practices and use cases for troubleshooting issues with Parallels Plesk Panel (Plesk) for Linux migration. Each section of this article contains cross-references to Parallels Knowledgebase (KB) articles for that particular stage of the migration process.

Helpful information in regards to Plesk for Windows can be found in the following KB article:

  • 113590 Parallels Plesk Panel for Windows: Migration Best Practices and Usecases

Table of contents

Make sure you have correctly prepared both of your servers for migration

To do so, refer to the article below:

  • 2112 How must a Plesk server be prepared for migration?
  • 117069 How to migrate domains that use custom DNS template

Migrating between different versions of Plesk

Before migrating between different versions of Plesk, make sure to read these threads:

  • 115103 Plesk Pre-Transfer Checker. The Plesk Pre-Transfer Checker is designed to allow providers to check for known cases that may cause migration failures and that should be fixed before starting a migration procedure.
  • 9578 How to convert and restore backups from an older version of Parallels Plesk Panel to version 10
  • 5969 How do you migrate Parallels Plesk Panel 9 and 10 using GUI Backup Manager?
  • 7021 Domain migration from Parallels Plesk Panel 7.x or 8.x to Parallels Plesk Panel 9.2 fails during SpamAssassin "action" element XML validation (applicable for 9.x)
  • 6807 Domain migration from a Plesk version older than v. 9.x fails
  • 9208 Migration from Plesk 7.5 to Plesk 9.3 fails with error "The attribute 'guid' is required but missing" (applicable for 9.x)

Mass migration

If you want to perform a mass migration, consider using the migration script described here:

  • 113283 Plesk Mass Migration Script

Migration from different platforms

Before migrating from a different control panel, make sure to read the following KB article:

  • 6337 How to migrate mail from non-PP hosting server to Parallels Plesk Panel

Manual migration tips and hints

If a manual transfer is required (for mail content, complete server after a crash, database moving, etc.), refer to the following sources:

  • 3072 How do I restore Plesk from the hard disk drive if the Operating System is broken and the HDD with the old OS and Plesk is mounted in the new system?
  • 1152 How to migrate Plesk data manually with Plesk Migration Manager
  • 6518 How to migrate local database between Parallels Plesk Panel servers manually (applicable for versions 8.x and 9.x)
  • 112812 How to migrate Customers and Business Manager data
  • 6158 How to migrate Сalendar, Personal Address Book, and Horde Webmail preferences manually
  • 5882 How to migrate Plesk and SiteBuilder content and retain Plesk and SiteBuilder integration (applicable for versions 8.x and 9.x)

Logs and log collector

In order to troubleshoot a logs issue, refer to the following Knowledgebase article:

  • 9679 Structure of Plesk Migration Manager (PMM) logs and PMM logs collector

Connectivity issues

Sometimes, migrating to another server is not possible due to connectivity problems between servers. Please refer to the following articles to check whether this is the case:

  • 5857 Plesk Migration Manager is missing in Parallels Plesk Panel 9.0 (applicable for version 9.0)
  • 8495 Migration does not start: “Error: No migration agents found. Data migration is not available”
  • 807 I am trying to use Migration Manager to transfer my accounts to Parallels Plesk Panel for UNIX server but get "connection failed" error


  • 111131 How to prevent mail users from seeing other users in control panel
  • 11213 Migration of mail users to Parallels Plesk Panel 10 fails with error "Unrecognized option: '-passwd_type'"
  • 114489 Mail backup takes too much time to restore

Missing something?

From time to time, you may encounter difficulties with migration due to some missing elements. The following resources will help you troubleshoot such scenarios:

  • 111810 Since "tar" is run under FTP user, files created with PHP scripts are lost from migration backup
  • 6627 SSL certificate from server repository is not migrated
  • 113497 Application entry point changed after migration
  • 9522 Crontab secure shell is incorrectly configured after migration
  • 9523 Shell description is missing from crontab files after migration
  • 111193 Plesk API doesn't add forwarding addresses on mailbox creation
  • 113065 DNS records pointing to external IP addresses are missing after migration
  • 8931 Wrong certificate is assigned to the domain after migration (applicable for versions prior to 10.x)
  • 7001 During migration to Parallels Panel 9.2.3, character "\" is doubled in mail account's password
  • 9421 Domain content is not migrated from Parallels Plesk Panel on FreeBSD
  • 113039 "fsDomain" parameter is not defined in "smb_settings" table
  • 115888 Older version of Webalizer on destination server may cause statistics to stop working after migration.

Error revealed

Periodically, an error may occur within log files or Plesk GUI messages, in which cases the following articles may be useful:

  • 111758 Migration of domains fails with IP conflict

    Unable to change the subscription owner: Required option "-map_ip [,]" is not set.
  • 6349 Migration fails with error: pmm utility "migration_handler" raised an exception. Error code is: 1

    pmm utility "migration_handler" raised an exception. Error code is: 1        
  • 6247 Domain cannot be migrated with error "Unable to create system user: usermng: PAM password change failed: 20, Authentication token manipulation error"

    An error occurred during domain update: error in hosting updating: Unable to update hosting preferences: system user update is failed: Unable to create system user: usermng: PAM password change failed: 20, Authentication token manipulation error
  • 5271 Migration fails with the "Some fields are empty or contain an improper value" message

    Error: Some fields are empty or contain an improper value.
  • 6019 Migration fails with error "Specified key was too long; max key length is 1000 bytes"

    Runtime error during db: (1, '', 'ERROR 1071 (42000) at line 323: Specified key was too long; max key length is 1000 bytes\n')
  • 111698 Migration fails with error "certificate with such name already exists"

    Unable to create certificate "default certificate": certificate with such name already exists
  • 830 When using the PMM to migrate Plesk data from FreeBSD, I receive this error after selecting the accounts to transfer:

    readResponse|handle 1|(14) data[Error: unable to connect to database: Can't connect to local MySQL server through socket$
  • 112879 Migration and backup fails with unclear error: "Object has been excluded from restore" (applicable for versions 10.x)

    Object has been excluded from restore
  • 6262 Migration fails with error "minimal value <= current value <= maximal value (!= 0)"

    Unable execute MigrationWait::make(): Unable to create bar: assigned values not like "minimal value <= current value <= maximal value (!= 0)
  • 8682 Migration fails with the error: Password should not be longer than 14 symbols (applicable for versions 8.x, 9.x)

    Password should not be longer than 14 symbols
  • 112964 Migration fails with error "Unable to create dump"

    Error: pmm utility migration_handler" raised an exception. Error code is: 1
    See pmmcli.log to find out detailed information on this
  • 112891 Database migration fails because MySQL dump is generated in wrong format

    ERROR:  (hosting object '<any domain with attached database>')       Failed deployment of database <name of database> (domain <any domain with attached database>)
    ERROR:  ()      Execution of /usr/bin/mysql --no-defaults -u admin -h localhost -P 3306 <name of database> failed with return code 1.
    Stdin is
    source <temporary path to backup file>;
    Stderr is
    ERROR 1064 (42000) at line 4 in file: "<temporary path to backup file>5": You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near -------------------------------------------------------
  • 112873 Subscription migration fails with error "Assertion failed: files.size() == 1"

    Assertion failed: files.size() == 1
  • 1253 I get this error during migration from Plesk server: "Illegal mix of collations"

    Illegal mix of collations
  • 112686 Cannot migrate client due to error: "Wrong syntax for command's '-phone' parameter"

    ERROR: (client object "testclient") Execution of /opt/psa/admin/plib/api-cli/client.php --update testclient -phone +44.466032321 -city Testcity -address Test\ 66\ bus\ 4 -company Testcompany -country GB -zip 1234 -state Test failed with return code 1.
    Stderr is
    Unable to update a user account:
    Wrong syntax for command's "-phone" parameter.
  • 113550 Plesk migration from source server with OpenSUSE fails with errors

    == STDERR ==================== 
    Cannot request remote agent status using command line /var/cache/20110902132102493/ Assertion ((svtype)((_svi)->sv_flags & 0xff)) == SVt_IV || ((svtype)((_svi)->sv_flags & 0xff)) >= SVt_PVIV failed: file "op.c", line 4161 at line 260. 
    Compilation failed in require at line 10. 
    BEGIN failed--compilation aborted at line 10. 
    Compilation failed in require at line 8. 
    BEGIN failed--compilation aborted at line 8. 
    Compilation failed in require at line 135. 
    BEGIN failed--compilation aborted at line 135. 
    Compilation failed in require at /var/cache/20110902132102493/ line 8. 
    BEGIN failed--compilation aborted at /var/cache/20110902132102493/ line 8. 
  • 111703 Domain migration fails with error "Object not found" (applicable for versions prior 10.4)

    Stderr is
    Object not found: Domain
  • 112872 Migration from Confixx fails with error "Failed deployment of /testdir (domain *.wildcardtest.tld)"

    Failed deployment of /testdir (domain *.wildcardtest.tld)
  • 115598 Default value of MySQL global variable "wait_timeout" on Source or/and Destination server can interrupt migration with error "MySQL server gone away"

    MySQL server gone away

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