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title: Security Group
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# Security Group

The **Security Group** tab controls the inbound and outbound traffic rules applied to the scale group's nodes. It is available when the group is **Running** or **Scaling**. Every node the Scaler launches inherits the security groups attached here.

A scale group must always have **at least one** security group attached — you cannot detach the last one.

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## What the Tab Shows

The tab lists the [security groups](/docs/myaccount/network/security_grp) attached to the scale group and their rules. For each rule you can review the protocol, port range, network type, and source/destination, just as on a node's security group.

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## Attach a Security Group

1. On the **Security Group** tab, choose a group to attach from the available list.
2. Confirm the attachment.

The portal applies the group's rules to the running group nodes (this can take a moment to propagate) and to any nodes the Scaler launches afterward.

## Detach a Security Group

1. On the **Security Group** tab, select the security group to remove.
2. Confirm the detachment.

You cannot remove the only attached security group — attach another first if you need to replace it.

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## Related Resources

| Resource                                                                                                                             | Use it for                                |
| ------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------------------- |
| [Manage Scale Groups](/docs/myaccount/auto-scaling/manage)                                                                           | Return to the management hub.             |
| [Security Groups](/docs/myaccount/network/security_grp)                                                                              | Create and edit security group rules.     |
| [Network and Load Balancer](/docs/myaccount/auto-scaling/manage/network)                                                             | Manage VPC and public IP for the group.   |
| [Available security groups (API)](/api/myaccount/compute/auto-scaling/get-scaler-scalegroups-remaining-security-group-auto-scale-id) | List groups you can attach.               |
| [Attach security group (API)](/api/myaccount/compute/auto-scaling/put-scaler-scalegroups-security-groups-auto-scale-id)              | Attach a security group programmatically. |

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