Authorization on the site does not work through active directory drupal 7 + ldap

Question

PHP

The situation is this, the site is on drupal 7, the ldap module is installed for synchronization with the active directory server, respectively, all accounts are taken from there.
At the most opportune moment, authorization on the site stopped working, with correct data, it displays that the login / password pair is incorrect.
I checked the configuration of the module, on the tab Servers -> test - all the rules, it displays data from ad correctly.
It is also possible to test authorization through the ldap_authorization module.
I try, I enter user login, displays the table with fields:
DRUPAL USERNAME
AUTHORIZATION TYPE
AUTHORIZATION IDS
CONFIGURATION
LDAP SERVER CONFIGURATION
Everything is correct in them too.
The strangest thing is that those users who have saved the session from the previous login enter the site normally => it is the authorization mechanism through the form that does not work.
I did not touch the kernel and modules, everything worked fine before the crash.
Drupal 7.22
Ldap - 7.x - 1.0 beta 12
Tell me where to dig, what else could be the problem?

Answer 1

The problem was solved by loading the old dump of the users table, I looked at the difference between the users and users tables from a week ago in toad for mysql - differing only in the access and login fields

Answer 2

Through user/login/sso - tried it?