Hi Kamil
Not if your manual account doesn't work, bind settings would only be required for an ldap login.
I built our school's Moodle install from scratch, installed the Apacheserver and the MySQLdatabase everything! We run on a windows 2008 r2 platform. All I can say is that I put in the LDAP bindings for our Moodle and left it at that. I did not run any sort of user sync or import and have not had a single problem with students (of which we have about 1600) logging in to Moodle. Moodle just accepts their username and password and authenticates them against our AD server. It worked first time for us and has been problem free since. I tried to setup SSO so that it would pick up the students windows login and that threw a hissy fit so I disabled SSO.
Can you login in as an admin user OK? because if you've got a setup similar to mine that user is manual so if he can login your manual authentication must be working.
It may be something silly like: you do know that passwords in the database table are MD5 encoded? So when I setup my admin account as a manual I jammed the MD5 equivalent of the password into the field in the database manually.
Your bind user needs to be an admin on the network you're connecting to, a regular user won't have permission to run LDAP checks. Otherwise (in the Moodle LDAP settings) check the type of binding you're trying to do matches e.g. MS ActiveDirectory. Then check the Distinguished Name . This is vitally important because it's got to point to the AD user account exactly, so ours is "cn=moodleadmin,ou=Moodle Admins,ou=Serviceaccounts,ou=<the school name>,dc=<first part of our domain>,dc=<second part of our domain>", because of the way the network manager setup the account in AD. But he setup the account as a clone of the administrator account for the entire network.
You could also check the firewall/port access on the Moodle and AD server. Try taking down the firewalls and see if you get a connection, if they're on a LAN it shouldn't be too stressful. Similarly any routers in between the two servers could have a firewall that interferes.
Without seeing your setup I couldn't actually say what's wrong but I will try to help as much as I can.
John Gifford