How Do I View and Modify ECS Security Group Rules?

On the ECS details page, click the Security Groups tab and view security group rules. To enable DAS to access the self-built DB instances on ECSs, you need to add an inbound rule with the port set to 3306 (example) and source to 100.0.0.0/8.

Figure 1 Security group rules
Click Manage Rule on the left. On the Inbound Rules tab page, click Add Inbound Rule. .

Figure 2 Adding an inbound rule

Recommended configuration: Select TCP for Protocol & Port, enter the port number of the self-built database, and set the source to 100.0.0.0/8 or 0.0.0.0/0.
On the Outbound Rules tab page, click Add Outbound Rule.

Figure 3 Adding an outbound rule

Recommended configuration: Select TCP for Protocol & Port, enter the port number of the self-built database, and set the source to 100.0.0.0/8 or 0.0.0.0/0.