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AWS Client VPN: Set Up Temporary SSO Access Without Idle Association Costs

Use SAML SSO, authorization rules, and security groups to limit AWS Client VPN access. Reduce idle association costs by timing network associations and cleaning up in the right order.
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You can make AWS Client VPN SSO-secured and temporary by authenticating users through a SAML 2.0 identity provider, limiting their network access with authorization rules and security groups, and associating target networks only for the access window. Disconnecting users alone does not stop the endpoint-association charge: AWS bills for each associated target network per hour, even when nobody is connected.

How the SSO and network controls fit together

AWS Client VPN is a managed, OpenVPN-based service. With SAML federated authentication, the AWS-provided client opens a browser for the user to sign in to the organization’s identity provider (IdP). The IdP returns a signed SAML assertion that the endpoint validates. This centralizes login, but it does not by itself decide which VPC networks or resources a user may reach.

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Use two distinct network controls after authentication:

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  • Authorization rules specify which networks VPN users or groups are permitted to access. SAML group claims can support group-based rules.
  • Security groups control traffic to the resources themselves. Use them to constrain permitted protocols, ports, and destinations rather than treating a successful VPN login as unrestricted access.

AWS Client VPN supports one IdP per endpoint. The SAML response and assertion must be signed, and the NameID must use an email address format. SAML-based MFA works when enabled by the IdP; SAML single logout is not supported. The AWS-provided client must be version 1.2.0 or later for the SAML flow. AWS also documents a 128 KB maximum SAML response and supported desktop browsers; verify its current client and browser requirements before rollout.

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Configure a SAML-backed endpoint

  1. Prepare the identity provider. Create a SAML application for AWS Client VPN or configure an existing one. Set up the trust relationship and download the IdP federation metadata document.
  2. Register the IdP in the right AWS account. In IAM, create a SAML identity provider using that metadata. It must be in the same AWS account as the Client VPN endpoint. AWS does not require an IAM role for this identity provider.
  3. Prepare the endpoint certificate. Request or import the server certificate in AWS Certificate Manager (ACM). The endpoint needs this certificate regardless of whether you authenticate with SAML, Active Directory, or mutual certificates.
  4. Create the Client VPN endpoint. Choose federated authentication and select the IAM SAML identity provider. Configure the client address range and other endpoint settings for your network design.
  5. Associate a target network and configure access. Associate the endpoint with a subnet, add the routes and authorization rules required for the intended destinations, and configure security groups to allow only necessary resource traffic.
  6. Distribute the connection configuration. Export the endpoint configuration and provide it to users with the AWS-provided client. Confirm that users can authenticate and reach only the intended resources.

Keep the AWS account, endpoint, IdP metadata, certificate, routes, authorization rules, and security groups in the same change plan. An endpoint can authenticate users correctly and still fail to provide useful access if its network routes or resource-level traffic rules are missing.

Estimate the cost of an access window

A useful service-charge estimate is:

Approximate Client VPN service charge = associated target-network hours × the regional association rate + active connection-hours × the regional connection rate.

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For the US East (Ohio) example on AWS’s pricing page, the association rate is $0.10 per endpoint-association hour and the connection rate is $0.05 per active connection-hour. In that example, one association plus ten active connections for one hour costs $0.60 total. These are Ohio example figures, not a universal quote; check AWS’s live pricing or calculator for the intended region and current rates.

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Usage pattern Association charge Connection charge Operational trade-off
Endpoint remains associated between sessions Continues for each associated target network-hour, including hours with no connected users. In the Ohio pricing example, the rate is $0.10 per association-hour. Applies to active connection-hours. In the Ohio pricing example, the rate is $0.05 per connection-hour. Users can connect without waiting for the network association to be provisioned, but idle association time costs money.
Temporary access window with associations removed afterward Reduced by limiting the time target networks remain associated. The applicable regional rate still applies during association hours. Applies while users are connected, at the applicable regional rate. Lower idle association spend in exchange for setup and teardown work and an interval when users cannot connect.

The association count matters: the charge is based on associated target networks, not merely on whether the endpoint has any connected users. A design with multiple associations for network placement or availability can therefore cost more in association-hours. Compare designs using the intended region, number of associations, duration, and expected active connections.

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Other charges may apply depending on configuration. These can include EC2 data transfer out, CloudWatch Logs usage when connection logging is enabled, Lambda invocations when a client-connect handler is configured, and public IPv4 charges for in-use addresses associated with Client VPN network interfaces in applicable internet-connected VPC setups. These are not charges that necessarily apply to every endpoint.

Choose between ready access and an ephemeral endpoint

Keep associations for readiness

An always-associated endpoint favors convenience and readiness. It suits teams that need access at unpredictable times and accept recurring association-hours as the cost of that availability. Disconnecting users reduces active connection-hours, but does not stop the association charge.

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Associate only around planned access

For scheduled development or administrative work, provision or retain the endpoint and its prerequisites, associate the target network near the start of the access window, and disassociate it afterward. This trims idle association time but adds operational delay. While there is no associated target network, users cannot connect through that network.

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“Ephemeral” does not mean that deleting the endpoint is a suspend switch. You can automate provisioning and cleanup, but plan explicitly for the endpoint, target-network associations, routes, authorization rules, certificates, logging, and any other resources your configuration uses. Terraform’s AWS provider includes an aws_ec2_client_vpn_endpoint resource; a complete infrastructure-as-code workflow must also manage related resources and their dependencies.

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Disassociate first, then delete

  1. End the access window. Tell users when access will stop and account for any active work. Deleting the endpoint is disruptive; clients cannot connect once endpoint deletion begins.
  2. Remove target-network associations. Disassociate every target network from the endpoint before attempting deletion. If you intend to reuse the endpoint later, leave it in place but remember that users cannot connect while it has no associated target network.
  3. Delete the endpoint when it is no longer needed. AWS requires all target networks to be disassociated first. Treat endpoint deletion as permanent teardown, not as a reversible pause.
  4. Inspect dependent resources and charges separately. Check the state of routes, security groups, certificates, logging destinations, Lambda handlers, and public IPv4 resources in your deployment. Do not assume endpoint deletion removes every related resource or charge.

Automate the same dependency order you would use manually: provision prerequisites, create the endpoint, associate the target network, configure routes and access, distribute the configuration, then disassociate target networks before deleting the endpoint. Review billing after cleanup to catch resources or usage that remain outside the endpoint lifecycle.

Other authentication choices

SAML is a good fit when centralized sign-in and IdP-managed user identities are required. AWS Client VPN also offers Active Directory authentication and mutual certificate authentication. Active Directory is another user-based option; mutual authentication relies on certificates rather than a federated user sign-in. The ACM server certificate requirement applies regardless of the authentication method. Choose based on identity operations and access policy, not on an assumption that changing authentication removes the association-hour cost.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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