使用 jQuery AJAX401(未经授权)的 ASP.NET 调用 WebMethod

已经被困了好几个小时了

{"Message":"Authentication failed.","StackTrace":null,"ExceptionType":"System.InvalidOperationException"}

我正在try 在我的ASP中调用此WebMethod.网络表单

[WebMethod]
public static string GetClients(string searchTerm, int pageIndex)
{
    string query = "[GetClients_Pager]";
    SqlCommand cmd = new SqlCommand(query);
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@SearchTerm", searchTerm);
    cmd.Parameters.AddWithValue("@PageIndex", pageIndex);
    cmd.Parameters.AddWithValue("@PageSize", PageSize);
    cmd.Parameters.Add("@RecordCount", SqlDbType.Int, 4).Direction = ParameterDirection.Output;
    return GetData(cmd, pageIndex).GetXml();
}

从这个jquery.AJAX

function GetClients(pageIndex) {
    $.ajax({
        type: "POST",
        url: "ConsultaPedidos.aspx/GetClients",
        data: '{searchTerm: "' + SearchTerm() + '", pageIndex: ' + pageIndex + '}',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: OnSuccess,
        failure: function (response) {
            alert(response.d);
            },
            error: function (response) {
                alert(response.d);
            }
    });
}

但我总是会犯这样的错误:

邮政http://localhost:64365/ConsultaPedidos.aspx/GetClients 401 (Unauthorized)

奇怪的是，在我开始对用户进行身份验证之前，这种方法一直有效

<system.web>
...
    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login" timeout="2880" defaultUrl="/Dashboard" />
    </authentication>
    <authorization>
      <deny users="?" />
    </authorization>
...
</system.web>

有什么 idea 吗？