Article ID: 121384, created on Apr 29, 2014, last review on Jun 8, 2016

  • Applies to:
  • Plesk 12.0 for Windows
  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows


Plesk upgrade fails with an error:

Access denied for user 'admin'@'localhost' 

When attempting to set the administrator password via the '%plesk_bin%\plesksrvclient' utility (launch with no arguments), there is an error:

Failed to connect to MySQL server


Old password entry is present in Plesk registry, or the MySQL database port value is not set.


  1. Check the following values in the Plesk registry hive and make sure they are set as below:

  2. Check if the following entry exists:


    Remove it if it exists.

Search Words

autoinstaller fails

(Error code 1603) Error: The installation of the package 'mysql-server-configurator' failed with code 1603. (upgrade: update configuration of MySQL server...)

Plesk Upgradation failed

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