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.
This feature supports the accessibility detection of common ports and custom ports. See below for the common ports.
|Inbound rules||ICMP protocol||Used to pass control messages such as the ping command. ICMP is a control protocol, and no ports are involved.|
|TCP:20||Used to allow uploads and downloads over FTP.|
|TCP:22||Used to allow Linux SSH login.|
|TCP:3389||Used to allow Windows remote login.|
|TCP:443||Used to provide website HTTPS service.|
|TCP:80||Used to provide website HTTP service.|
|Outbound rules||ALL||Used to allow all outbound traffic for access to external networks.|
Log in to the VPC console.
Click Diagnostic Tools > Port Verification in the left sidebar to access the management page.
Select a region at the top of the page, locate the instance you want to verify in the list, and click Quick Check.
You can see the port detection details in the pop-up window. Perform the following operations as needed.
If you need to detect the outbound traffic towards IP 10.0.1.12 using TCP protocol through port 30, enter the following information in the Custom port detection area.
After completing the configuration, click Detect. The result will be displayed in the Policy column.
Assumes that you need to open an Not opened port, for example TCP:22,
Then you can add an inbound rule for the security group associated with the instance in the Security Group console to open port TCP:22. You can select all for Source to allow all IPs, or enter a specific IP (IP range).