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# AWS::EC2::LaunchTemplate ConnectionTrackingSpecification

A security group connection tracking specification that enables you to set the idle timeout for connection tracking on an Elastic network interface. For more information, see [Connection tracking timeouts](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/security-group-connection-tracking.html#connection-tracking-timeouts) in the *Amazon EC2 User Guide*.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "[TcpEstablishedTimeout](#cfn-ec2-launchtemplate-connectiontrackingspecification-tcpestablishedtimeout)" : {{Integer}},
 "[UdpStreamTimeout](#cfn-ec2-launchtemplate-connectiontrackingspecification-udpstreamtimeout)" : {{Integer}},
 "[UdpTimeout](#cfn-ec2-launchtemplate-connectiontrackingspecification-udptimeout)" : {{Integer}}
}
```
### YAML

```
 [TcpEstablishedTimeout](#cfn-ec2-launchtemplate-connectiontrackingspecification-tcpestablishedtimeout): {{Integer}}
 [UdpStreamTimeout](#cfn-ec2-launchtemplate-connectiontrackingspecification-udpstreamtimeout): {{Integer}}
 [UdpTimeout](#cfn-ec2-launchtemplate-connectiontrackingspecification-udptimeout): {{Integer}}
```
## Properties

`TcpEstablishedTimeout` 
Timeout (in seconds) for idle TCP connections in an established state. Min: 60 seconds. Max: 432000 seconds (5 days). Default: 350 seconds for Nitro v6 instance types (excluding P6e-GB200); 432000 seconds for all other instance types (including P6e-GB200). Recommended: Less than 432000 seconds. 
*Required*: No 
*Type*: Integer 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`UdpStreamTimeout` 
Timeout (in seconds) for idle UDP flows classified as streams which have seen more than one request-response transaction. Min: 60 seconds. Max: 180 seconds (3 minutes). Default: 180 seconds. 
*Required*: No 
*Type*: Integer 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`UdpTimeout` 
Timeout (in seconds) for idle UDP flows that have seen traffic only in a single direction or a single request-response transaction. Min: 30 seconds. Max: 60 seconds. Default: 30 seconds. 
*Required*: No 
*Type*: Integer 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)</div><div class="naked_ctrl">
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