Delete the security group
Before deleting a group, you must disconnect it from all ports to which it is assigned.
Control Panel
OpenStack CLI
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Make sure to disable the security group from all ports. You can view the list of ports with the group in the Control Panel: from the top menu, click Products → Cloud Servers → Security Groups → Security Group page → Ports tab.
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In the Dashboard, on the top menu, click Products and select Cloud Servers.
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Go to the Security Groups section.
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From the menu of the security group, select Delete.
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Click Delete.