远程导入库中报错!本地测试正常!服务器本地测试也正常!(高手?)

我做了一个EXCEL导入,在我本地测试的时没没事,成功写到表中.传到服务器上,在服务器上测试也不报错.
做了一个IIS后,在外网输入IP地址后报错!
代码如下:   protected void Button1_Click1(object sender, EventArgs e)
    {
        string filePath = "";
        conn = new SqlConnection(ConfigurationManager.AppSettings["YxConnection"].ToString().Trim());
                if (FJ.PostedFile.FileName == "")
        {
            Response.Write("<script language=javascript>alert('请选择要上传的文件！');</script>");
            return;
        }
        else
        {
            filePath = FJ.PostedFile.FileName;//取得文件路径
            string sql_excel = "select mobile from OPENROWSET('MICROSOFT.JET.OLEDB.4.0','Excel 8.0;HDR=YES;DATABASE=" + filePath + "',sheet1$)";
            cmd = new SqlCommand(sql_excel, conn);
            SqlDataAdapter adapter = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            DataTable dt = new DataTable();
            adapter.Fill(ds, "result");
            dt = ds.Tables["result"];
            GridView1.DataSource = dt;
            GridView1.DataBind();
            if (ds.Tables["result"].Rows.Count != 0)
            {
                string sql = "";                SqlConnection myConnection = new SqlConnection();
                string strConn = System.Configuration.ConfigurationManager.AppSettings["YxConnection"].ToString();
                myConnection.ConnectionString = strConn;
                SqlCommand da = new SqlCommand();
                try
                {
                    for (int i = 0; i < ds.Tables["result"].Rows.Count; i++)
                    {
                        sql = "insert into table1(mobile) values ('" + ds.Tables["result"].Rows[i]["mobile"].ToString() + "')";
                        da = new SqlCommand(sql, myConnection);
                        if (da.Connection.State.ToString() == "Closed")
                        {
                            da.Connection.Open();
                        }
                        da.ExecuteNonQuery();
                    }
                }
                catch (Exception ex)
                {
                    getErrMsg = ex.Message.ToString();
                    Response.Write(ex.Message.ToString());
                }
                finally
                {
                    da.Connection.Close();
                    da = null;
                }
                if (getErrMsg == "" || getErrMsg == null)
                {
                    Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script language='Javascript'>alert('导入成功！')</script>");
                    return;
                }
                else
                {
                    Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script language='Javascript'>alert('导入失败！')</script>");
                    return;
                }
            }
        }
    }