Hi All, I am using OTRS with LDAP authentication. All of its are working fine. I've enabled LDAP authentication for both agents and costumers. But some users cannot login into OTRS via LDAP. I can't solve this problem. I've compared users in AD tree by using LDAP browser. But found no difference between users (logged and can't logged). Error message is: Oct 27 10:23:12 otrs OTRS-CGI-10[52875]: [Notice][Kernel::System::Auth::LDAP::Auth] User: username (CN=USERNAME,CN=Computers,DC=xxx,DC=com) authentication failed: '80090308: LdapErr: DSID-0C090334, comment: AcceptSecurityContext error, data 52e, vece Oct 27 10:23:12 otrs OTRS-CGI-10[52875]: [Error][Kernel::System::User::UserLookup][Line:696]: No UserID found for 'username'! What should I do? Please, help me... -- Altangerel Ganbold