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:
|Inbound rules||TCP:3389||Used to permit Windows remote login.|
|TCP:22||Used to permit Linux SSH login.|
|TCP:443||Used to provide website HTTPS service.|
|TCP:80||Used to provide website HTTP service.|
|TCP:21||Used to permit uploads and downloads over FTP.|
|ICMP protocol||Used to provide website HTTP service.|
|Outbound rules||ALL||Used to permit all outbound traffic for access to external networks.|
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.