Article ID: 127409, created on Nov 13, 2015, last review on Nov 13, 2015

  • Applies to:
  • Plesk 12.5 for Windows
  • Plesk 12.0 for Windows


Plesk upgrade failed with similar error:

Failed to connect to database: Access denied for user 'local_mysql_root'@'' (using password: YES)
   at (MySQLDatabaseProvider::connect line 420)
   at MySQL connection failed(MySQLServerManager::check line 28)
   at (MySQLServerManager::check line 34)
   at execute console command --add-local-super-user(vconsoleapp::start line 100)
   at execute "C:\Program Files (x86)\Parallels\Plesk\admin\bin\mysqlmng.exe" --add-local-super-user(vconsoleapp::run line 117) Execute file name: C:\Program Files (x86)\Parallels\Plesk\admin\bin\mysqlmng.exe


Installer is trying to connect to MySQL using '' instead of localhost. In database, the user 'local_mysql_root' is configured for the 'localhost' only.


  1. Make sure that only address is assigned to your server hostname '' in C:\Windows\System32\drivers\etc\hosts:
  2. Run installer again.

Search Words

Failed to connect to database Access denied for user local_mysql_root

access denied

mysqlmng.exe --add-local-super-user

Failed to connect to database: Access denied for user 'local_mysql_root'

Access denied for user 'local_mysql_root'

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