Graylog, LDAP bind issue when trying to make the connection, incorporate AD. Please help!

Here is the error message:
MessageType : BIND_RESPONSE
Message ID : 4
    BindResponse
        Ldap Result
            Result code : (INVALID_CREDENTIALS) invalidCredentials
            Matched Dn : ''
            Diagnostic message : '80090308: LdapErr: DSID-0C0903CF, comment: AcceptSecurityContext error, data 52e, v2580'
Also:
Diagnostic message : '80090308: LdapErr: DSID-0C0903CF, comment: AcceptSecurityContext error, data 775, v2580'

The server configuration makes a successful connection to Active Directory but cannot bind.
Here are my settings:

Server address: ldap://x.x.x.x:389
username: admin@domain.com
Search Base DN: dc=dc,dc=name,dc=com
User Search Pattern: (objectClass=user)
Display Name attribute: displayName
Group Search Base DN: dc=prod,dc=Admi,dc=Com
Group Search Pattern: (objectClass=group)
Group Name Attribute: cn
Default User Role: Administrator
ALL SEEMS WELL UNTIL...
Login test: Domain Admin
password: xxxxx
Tried: admin@domain.com as well...no luck
User account is fine, not locked out etc and works for everything BUT Graylog. I hit "Test Login":



MessageType : BIND_RESPONSE
Message ID : 4
    BindResponse
        Ldap Result
            Result code : (INVALID_CREDENTIALS) invalidCredentials
            Matched Dn : ''
            Diagnostic message : '80090308: LdapErr: DSID-0C0903CF, comment: AcceptSecurityContext error, data 775, v2580'