LDAP Setting is working but can't login with AD count

Our OMi have the LDAP setting. It's be fine for long time, but it's can't login with AD's count/password recently.

We have to test the LDAP connection, it can generate the results about AD's LDAP.

The Login Web had the message "Your login attempt was not successful. The login name and password combination is invalid or the user is not set up." when we try to login with AD count.

We can login with the count id and password to AD, the AD's count/password is OK.

I don't know how to solve this problem, please help me.