The instance port verification feature can help you detect the accessibility of security group ports of CVM instances, locate faults, and enhance the user experience.
The following ports can be verified:

Operation Guide

1. Log in to the VPC console.
2. Click Diagnostic Tools -> Instance Port Verification in the directory on the left to enter the management page.
3. Select Region at the top of the page and, in the displayed list, find the instance to be verified and click Quick Check in the same row.
   
4. You can see the port verification details in the pop-up window. To open ports that are not open to the Internet, click Open All Ports.

   Note：

   Open All Ports will open all listed ports. If you only need to open certain ports (such as TCP:22), add an inbound rule on the Security Group Console to open port TCP:22. For more information, see Adding Security Group Rules.