+# If they're not root, but their user exists (success),
+auth [success=ignore ignore=ignore default=1 module_unknown=die] pam_succeed_if.so uid > 0
+# print the "You don't have tickets" error:
+auth [success=die ignore=reset default=die module_unknown=die] pam_echo.so file=/etc/issue.net.no_tkt
+# If !(they are root),
+auth [success=1 ignore=ignore default=ignore module_unknown=die] pam_succeed_if.so uid eq 0
+# print the "your account doesn't exist" error:
+auth [success=die ignore=reset default=die module_unknown=die] pam_echo.so file=/etc/issue.net.no_user
+