Plesk is not accessible: The system cannot find file specified. Hierarchical.php or Unable to create file shared_memory.lock: Permission denied

Symptoms

• Cannot log in to Plesk or apply changes in Plesk:

  PLESK_INFO: The system cannot find file specified.
  File: Hierarchical.php

  ---

  PLESK_INFO: Server Error
  500
  PleskLockException
  Lock Manager error: ‘Unable to create file: C:/Program Files (x86)/Parallels/Plesk/var/locks/shared_memory.lock: Permission denied’.

  Type PleskLockException
  Message Lock Manager error: ‘Unable to create file: C:/Program Files (x86)/Parallels/Plesk/var/locks/shared_memory.lock: Permission denied’.
  File Hierarchical.php
  Line 126

• The following error could be found in %plesk_dir%adminlogsphp_error.log :

  ERR [panel] The system cannot find the file specified.:
   0: C:Program Files (x86)PleskadminplibLockManagerHierarchical.php:201 
   LockQuery->lock(string '') 
   ...

• Ransomware_ext template is configured at Administrative Tools > File Server Resource Manager > File Screening Management > File Screens section, including restrictions for *.lock files:

  

   

  

Cause

Anti-Ransomeware File Group blocks *.lock files that are required for Plesk operability.

Resolution

Exclude the path to Plesk installation directory ( %plesk_dir% ) from this group using Microsoft article.