AWS SDK Version 3 for .NET
API Reference

AWS services or capabilities described in AWS Documentation may vary by region/location. Click Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region.

Replaces the set of policies associated with the specified port on which the EC2 instance is listening with a new set of policies. At this time, only the back-end server authentication policy type can be applied to the instance ports; this policy type is composed of multiple public key policies.

Each time you use SetLoadBalancerPoliciesForBackendServer to enable the policies, use the PolicyNames parameter to list the policies that you want to enable.

You can use DescribeLoadBalancers or DescribeLoadBalancerPolicies to verify that the policy is associated with the EC2 instance.

For more information about enabling back-end instance authentication, see Configure Back-end Instance Authentication in the Classic Load Balancer Guide. For more information about Proxy Protocol, see Configure Proxy Protocol Support in the Classic Load Balancer Guide.


For .NET Core and PCL this operation is only available in asynchronous form. Please refer to SetLoadBalancerPoliciesForBackendServerAsync.

Namespace: Amazon.ElasticLoadBalancing
Assembly: AWSSDK.ElasticLoadBalancing.dll
Version: 3.x.y.z


public virtual SetLoadBalancerPoliciesForBackendServerResponse SetLoadBalancerPoliciesForBackendServer(
         SetLoadBalancerPoliciesForBackendServerRequest request
Type: Amazon.ElasticLoadBalancing.Model.SetLoadBalancerPoliciesForBackendServerRequest

Container for the necessary parameters to execute the SetLoadBalancerPoliciesForBackendServer service method.

Return Value
The response from the SetLoadBalancerPoliciesForBackendServer service method, as returned by ElasticLoadBalancing.


AccessPointNotFoundException The specified load balancer does not exist.
InvalidConfigurationRequestException The requested configuration change is not valid.
PolicyNotFoundException One or more of the specified policies do not exist.


This example replaces the policies that are currently associated with the specified port.

To replace the policies associated with a port for a backend instance

var response = client.SetLoadBalancerPoliciesForBackendServer(new SetLoadBalancerPoliciesForBackendServerRequest 
    InstancePort = 80,
    LoadBalancerName = "my-load-balancer",
    PolicyNames = new List {


Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms

See Also