ASP.NET Calling WebMethod with jQuery AJAX "401 (Unauthorized)"

Question

Been stuck with this for hours

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

I'm trying to call this WebMethod in my ASP.Net Webform

[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();
}

From this 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);
            }
    });
}

But I always get this error:

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

Weird thing is that this used to work until I start authenticating users

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

Any ideas?

Answer 1

Problem solved

This was driving me crazy.

Inside ~/App_Start/RouteConfig.cs change:

settings.AutoRedirectMode = RedirectMode.Permanent;

To:

settings.AutoRedirectMode = RedirectMode.Off;

(Or just comment the line)

Also if friendly URLs are enabled you need to change

url: "ConsultaPedidos.aspx/GetClients",

To:

url: '<%= ResolveUrl("ConsultaPedidos.aspx/GetClients") %>',

Hope this help somebody else