When trying to log in to Plesk interface the following error appears:
HTTP Error 500.0 - Internal Server Error
An unknown FastCGI error occured
Detailed Error Information
Or Plesk shows the following error on access:
PHP Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0
PHP Fatal error: Unknown: Failed opening required 'auth.php' (include_path='C:\\Program Files (x86)\\Parallels\\Plesk\\admin\\plib;C:\\Program Files (x86)\\Parallels\\Plesk\\admin\\externals') in Unknown on line 0
According to process monitor there are no permissions given to
psaadm user on
psaadm user with required permissions does not help.
psaadm user is a member of
psaserv group in the system, but it was not supposed to be,
psaserv group has "Deny" permissions on
%plesk_dir%\\admin\\bin\\ that is why the issue appears.
psaadm user should not be a member of any group, remove all groups from the list under Member of tab in the user settings