Improperly set security group rules (for example, those that do not restrict access to specified ports) can incur severe security risks. In this case, you can modify these security group rules in a security group to ensure the network security of CVM instances. This document describes how to modify security group rules.
You have created a security group and added security group rules to the group.
For information on how to create a security group and add security group rules, see Creating a Security Group and Adding Security Group Rules.
Note:You don't need to restart the CVM for the rule changes to take effect.
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