WCF Security exception when calling from Windows Service
BasicHttpBinding httpBinding = new BasicHttpBinding();
    httpBinding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
    httpBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;
    httpBinding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.None;
    httpBinding.Security.Transport.Realm = service_realm;

    EndpointAddress address = new EndpointAddress(service_address);

    Service.ServiceClient client = new Service.ServiceClient(httpBinding, address);

    client.ClientCredentials.UserName.UserName = service_username;
    client.ClientCredentials.UserName.Password = service_password;