Not able to login to cups web admin interface with other user than root

[Stéphane Purnelle]

With cups 1.1.23, I can set a user group which can connect to cups for manage it.  This group is located on a ldap tree.

Now, I switched to cups 1.2.1, 1.2.2 and now 1.2.3 and this possibility is not exist or not work !

I have in error_log :
cupsdAuthorize: pam_authenticate() returned 9 (Authentication service cannot retrieve authentication info.)!

getent group work fine.

I tried with old parameter ( AuthClass Group AuthGroupName Prtoper)
 and newer parameter (Require group @xxxxxx)