Security groups act as virtual firewalls for ECM instances. Each ECM instance must be associated with at least one security group. If you haven't created a security group when creating an ECM instance, Tencent Cloud provides two templates (Open all ports and Open ports 22, 80, 443, and 3389 and ICMP protocol) for quick security group creation. For more information, see Security Group.
This document describes how to create a security group in the ECM console.
|Open all ports||All ports are open. May present security issues.||-|
|Open ports 22, 80, 443, and 3389 and ICMP protocol||Ports 22, 80, and 443 and 3389, and the ICMP protocol are open. All ports are open internally.||Suitable for instances with web services.|
|Custom||You can create a security group and then add custom rules. For detailed directions, see Adding Security Group Rule.||-|