Some actions can not be performed in Plesk: Unable to execute long task: Unable to logon user

Symptoms

Unable to export database dump:

PLESK_ERROR: Task async execution failed: Unable to execute application.

The following errors can be found in %plesk_dir%\admin\logs\php_error.log:

CONFIG_TEXT: PHP Warning: Unable to execute long task: Unable to logon user (.\psaadm): (1385) Logon failure: the user has not been granted the requested logon type at this computer.
at LogonUser(.\psaadm)(CClientProfile::logon line 126)
at Plesk impersonation(PipeServer::ServerThread::runAs line 715)
at (zif_long_task_exec line 1356) in C:\Program Files (x86)\Plesk\admin\plib\Task\Executor\Async.php on line 30
ERR [panel] Task async execution failed: Unable to execute application.

CONFIG_TEXT: PHP Warning: Unable to execute long task: Unable to logon user (.\psaadm): (1326) The user name or password is incorrect.<br> at LogonUser(.\psaadm)(CClientProfile::logon line 126)<br> at Plesk impersonation(PipeServer::ServerThread::runAs line 719)<br> at (zif_long_task_exec line 1356); File: C:\Program Files (x86)\Plesk\admin\plib\Task\Executor\Async.php, Line: 30

ERR [panel] Exception: PHP Warning: Unable to execute long task: Unable to logon user (.\psaadm): (1326) The user name or password is incorrect.

Cause

Failure of PageSpeed extension actions due to wrong permissions.

Resolution

1. Connect to the server via RDP

2. Start Plesk Reconfigurator at Windows Start > All Programs > Plesk

3. In Plesk Reconfigurator, click Repair Plesk installation.

4. Select the following:

   • Plesk Server Accounts
   • Plesk file security
   • Plesk Services

5. Click Check.