The instance port verification feature can help you detect the port accessibility of a security group associated with CVM instances, locate faults, and improve the user experience.
You can verify the following ports:

Operations Guide

1. Log in to the VPC console.
2. Click Diagnostic Tools > Port Verification in the left sidebar to access the management page.
3. Select a region at the top of the page, locate the instance you want to verify in the list, and click Quick Check.
   
4. You can see the port verification details in the pop-up window. To open all ports for inbound and outbound traffic, click Open all ports.
   
   If you only need to open certain ports, for exampleTCP:22, you can add an inbound rule for the selected ID/Name in Security Group console to open port TCP:22. You can also select all for Source to open all IPs, or enter a specific IP (IP range), as shown below:
   

Relevant Information

• For information on security groups, see Security Group Overview and Adding a Security Group Rule.
• For more information on common ports, see Common Server Ports.