Why Does My ASP.NET WebMethod Return a 401 (Unauthorized) Error After Authentication?

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

This issue occurs when calling a WebMethod in ASP.NET with jQuery AJAX after implementing user authentication in the application. The user is authenticated, but the WebMethod call fails with a 401 (Unauthorized) error.

To resolve this issue, check the following solutions:

• Modify RouteConfig.cs: In the ~/App_Start/RouteConfig.cs file, disable the automatic URL redirection by commenting or changing the following line:

  settings.AutoRedirectMode = RedirectMode.Permanent;

  To:

  settings.AutoRedirectMode = RedirectMode.Off;

• Specify Absolute URL: If friendly URLs are enabled, replace the URL in the AJAX call with the absolute path to the WebMethod. For example, change:

  url: "ConsultaPedidos.aspx/GetClients",

  To:

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

By implementing these fixes, the WebMethod call should now succeed with authentication properly enforced.

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