After applying these commands. ~# chgrp -R psaadm /usr/local/psa/admin/libexec ~# chgrp -R psaadm /usr/local/psa/admin/sbin ~# chgrp psaadm /usr/local/psa/admin/sessions I can't log in to my plesk . I get following error message. Components::componentUpdate() failed: Unable to exec utility packagemng: packagemng: failed to open semaphore file /usr/local/psa/var/utilities.sem: Permission denied System error 13: Permission denied Please help to resolve this problem. i think it's a permission problem.