Plesk is not accessible after upgrade from Plesk Onyx to Plesk Obsidian: Unable to create file: C:/Program Files (x86)/Plesk/var/locks/authorizer.lock: Permission denied

Updated July 15, 2021 16:29

kb: technical ABT: Group A Plesk Obsidian for Windows

Applicable to:

Plesk is not accessible:

PLESK_INFO: HTTP Error 500.0 - Internal Server Error
C:\Program Files (x86)\Plesk\admin\engine\php-cgi.exe - The FastCGI process exited unexpectedly
Accessing Plesk directly on the server via RDP the following detailed information is shown:

CONFIG_TEXT: Server Error
500 Plesk\Lock\Exception
Lock Manager error: 'Unable to create file: C:/Program Files (x86)/Plesk/var/locks/authorizer.lock: Permission denied'.

CONFIG_TEXT: ERR [panel] Lock Manager error: 'boost::filesystem::status: Access denied: "C:\Program Files (x86)\Parallels\Plesk\var\locks"'.:

Missing user psaadm_users for the folder and all the subfolder/files of C:/Program Files (x86)/Plesk/var/locks/

Note: Another solution is to use the Plesk Reconfigurator > Check components and folders permissions > Select Plesk. But it will take quite a lot.

Connect to the server via RDP
Open properties of C:/Program Files (x86)/Plesk/var/locks/ folder mentioned in the error and switch to the Security tab.
Add the username psaadm_users with all the permission as allow:
Click Ok to save.