For most AD setups the following will work. You will need to know the AD domain name.

Tip:

If you dont have the AD domain name, it can be found by opening a Command Prompt on a computer that is currently logged into the AD and typing

echo %USERDNSDOMAIN%

Configure a LDAP server with the following (assuming the AD domain name is tenmiles.com)

• Configuration Name: (this will be shown on the login page dropdown - use something that your users can identify the login mode with)
• Hostname: tenmiles.com
• SSL: (leave as No)
• Port Number: (leave empty, the default port 389 will be used)
• Bind RDN: {{user_name}}@tenmiles.com
• Search Base DN: dc=tenmiles,dc=com
• Search Filter:  sAMAccountName={{user_name}}

(also see attached screenshot)
 
Tips:
a) If only member of a particular AD group should be allowed to login, use the following for Search Filter (assuming the group name is Help Desk Staff)
(&(sAMAccountName={{user_name}})(memberOf=CN=Help Desk Staff,OU=Staff,DC=tenmiles,DC=com))