Sobre Web Services

Tengo el sgte error

Exception Details: System.Net.WebException: The request
failed with HTTP status 401: Access Denied.


Line 35:
[System.Web.Services.Protocols.SoapDocumentMethodAttribute
("http://tempuri.org/InsertarArea",
RequestNamespace="http://tempuri.org/",
ResponseNamespace="http://tempuri.org/",
Use=System.Web.Services.Description.SoapBindingUse.Literal
,
ParameterStyle=System.Web.Services.Protocols.SoapParameter
Style.Wrapped)]
Line 36: public void InsertarArea(int CantMaxima,
string Descripcion, int CodPtoVenta) {
Line 37: this.Invoke("InsertarArea", new
object[] {
Line 38: CantMaxima,
Line 39: Descripcion,