> For the complete documentation index, see [llms.txt](https://karansingh.gitbook.io/aws-saa-c02/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://karansingh.gitbook.io/aws-saa-c02/elb/connection-draining-deregistration-delay.md).

# Connection Draining/Deregistration Delay

* **For CLBs, it is called Connection Draining**.
  * But, **for Target Groups (so ALBs and NLBs), it called Deregistration Delay**.<br>

* To ensure that a **Load Balancer stops sending requests to instances that are de-registering or unhealthy**, while keeping the existing connections open, use connection draining.

  * This **enables the load balancer to complete in-flight requests made to instances that are de-registering or unhealthy**.

* When you enable connection draining, you **can specify a maximum time for the load balancer to keep connections alive before reporting the instance as de-registered**.
  * The **maximum timeout value can be set between 1 and 3,600 seconds** (the **default is 300 seconds**).
    * **When the maximum time limit is reached, the load balancer forcibly closes connections** to the de-registering instance.