Alibaba Cloud server open port settings (super detailed)

1. After logging in to your Alibaba Cloud account, click on the console
   

2. Click Custom View→Click Cloud Server ECS
   

3. Click the instance ID to enter the instance:
   

4. Click on the security group of this instance:
   

5. Click the security group ID or configure rules to enter the security group rule configuration interface. You can choose the adding method. Here, manual addition is used as a demonstration.
   

6. After clicking Manual Add, the Add column will appear. We configure port 521, select 0.0.0.0/0 as the source (meaning it is open to everyone), and finally click Save to release the port and the setting is complete.
   

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In addition, you can also enter the local instance security group from another place:
(1) After clicking on the cloud server ECS (step 3 above) and entering the instance page, you can directly click on the instance

(2) Select the instance on the far right of which you want to release the port. More →Network and Security Group→Security Group Configuration

After clicking, the interface you will enter is the same as step 4. The subsequent steps are the same as above.