Security group configuration
Remember! Remember! ! Remember! ! ! , do not go to the network and security to set the security group, the security group set in the network and security is the security group of this account, you must set the security group of this instance! ! ! !
1. Click ECS
2. Click the instance
3. Click the instance ID
4. Click the security group of this instance
5. Configure rules
6. Configure the security group
