File Manager or Backup Manager fails for all domains: Directory does not exist or isn't writable: C:\Program Files (x86)\Plesk\PrivateTemp

Symptoms

• Error when accessing Subscriptions > Subscription name > File Manager in Plesk UI:

  PLESK_ERROR: Unable to find the directory C:\Inetpub\vhosts\domain.tld: filemng failed: plesk_exec_with_response("C:\Program Files (x86)\Plesk\admin\bin\filemng" test list dirs C:\Inetpub\vhosts\domain.tld) failed: Unable to execute plesk_exec_with_response: Unable to start ("C:\Program Files (x86)\Plesk\admin\bin\filemng.exe" test list dirs C:\Inetpub\vhosts\domain.tld): (267) The directory name is invalid.<br> at Plesk impersonation(PipeServer::ServerThread::runAs line 751)<br> at (zif_plesk_exec_with_response line 1140)
  File FileManagerController.php
  Line 1059
  Type PleskUtilException)

• Unable to open Tools and Settings > Backup Manager

  CONFIG_TEXT: 500 Directory does not exist or isn't writable: C:\Program Files (x86)\Plesk\PrivateTemp

Cause

Incorrect permissions on %plesk_dir%\PrivateTemp or the folder is missing.

Resolution

1. Connect to the server via RDP.

2. Check if %plesk_dir%\PrivateTemp exists;

3. Fix permissions on %plesk_dir%\PrivateTemp: Right-click Properties in %plesk_dir%\PrivateTemp, then go to Security > find psaadm user. Make sure that psaadm user has "Full Control" for this folder.