操作系统之间的 LDAP 连接差异

Question

我有在两个不同系统上执行 LDAP 查询的相同方法。该方法非常简单：

Public Function AutenticaDominio(ByVal user As String, ByVal ambiente As String) As String


    Dim Comm As New ADODB.Command
    Dim conn As New ADODB.connection

    Dim rs As New ADODB.Recordset
    Dim codiceBanca As String

    Dim currentAmbiente As String
    Dim currentName As String
    Dim trovato As Boolean
    Dim UserName As String

    Set conn = CreateObject("ADODB.Connection")
    conn.Provider = "ADsDSOObject"
    conn.Properties("User ID") = "XXX"
    conn.Properties("Password") = "XXX"
    conn.Open "DS Query", "XXX", "XXX"
    Set Comm = CreateObject("ADODB.Command")
    Set Comm.ActiveConnection = conn
    Comm.CommandText = "SELECT SBAcodicebanca FROM 'LDAP://abc.cde.fgh.it/ou=bank,dc=cde,dc=it' WHERE uid = '" & user & "' and SBAelencoambienti = 'sbacodicesottoambiente=GEST,sbacodiceambiente=PROT,ou=applicazioni,dc=cde,dc=it'"
    rs.CursorLocation = adUseClient
    Set rs = Comm.Execute

    If rs.EOF = False Then
       If rs.Fields.Item(0) = "099" Then
          Autentica = rs.Fields.Item(0)
          Exit Function
       Else
               Autentica = ""
       End If
    Else
        Autentica = ""
    End If

End Function

rs.execute 语句，在 Windows XP 上运行该方法时返回“未指定错误”。该方法在 Windows 7 上运行良好。

该项目是相同的，具有相同的参考和组件。

有谁知道哪里可能出现错误？