Some actions can not be performed in Plesk: Task async execution failed: Unable to execute application.

Symptoms 

• Unable to export database dump:

  Task async execution failed: Unable to execute application.

• Many actions in Plesk fails with the error below found in %plesk_dir%adminlogsphp_error.log file:

  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)PleskadminplibTaskExecutorAsync.php on line 30
  ERR [panel] Task async execution failed: Unable to execute application.

  ---

  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)PleskadminplibTaskExecutorAsync.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

Wrong permissions for psaadm user.

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 options Plesk Server Accounts, Plesk File Security and Plesk Services, then click Check: