Authentication failed, please check:
- attributes "s", user "root", group "root" for file pam-auth
- file /etc/pam.d/other
- data in /etc/pam.d/other:
  auth     required       pam_unix.so
  account  required       pam_unix.so
  password required       pam_unix.so
  session  required       pam_unix.so
- validation of values user,password in your dialog box

