Security Group
A security group is a virtual firewall that controls the incoming and outgoing traffic for instances or resources within a network.
To Create a Security Group follow links.
After creating the security group to attach your server.
Security Group Update
The current Security Group has been set to the default configuration, including the rules.

To add a custom Security Group, follow
Security Groups > Add Security Group

Select the created security group

For more details about security groups follow these links.
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