ASP - LDAP Authentication

Hi,

i am trying to Authenticate user using LDAP on win2003 from my ASP application.
i always get result as "Failed" when ever i run this code even for existing users.
please correct my code where ever .

ASP -> legacy

FYI, i have another code which works fine and retrieves UserName - Emai l- Phonenumber  when Passed userID
for the same LDAP://Domain

function AuthenticateUser(UserName, Password, Domain)
dim strUser
' assume failure
AuthenticateUser = false

strUser = UserName
strPassword = Password
'response.write(UserName&"---"&Password)
strQuery = "SELECT cn FROM 'LDAP://" & Domain & "' WHERE objectClass='*' "
set oConn = server.CreateObject("ADODB.Connection")
oConn.Provider = "ADsDSOOBJECT"
oConn.Properties("User ID") = strUser
oConn.Properties("Password") = strPassword
oConn.Properties("Encrypt Password") = true
oConn.open "DS Query", strUser, strPassword

set cmd = server.CreateObject("ADODB.Command")
set cmd.ActiveConnection = oConn
cmd.CommandText = strQuery
on error resume next
set oRS = cmd.Execute
if oRS.bof or oRS.eof then
AuthenticateUser = false
else
AuthenticateUser = true
end if
set oRS = nothing
set oConn = nothing

end function