By using the instance port verification feature, you can check the accessibility of the security group ports of CVM instances, locate faults, and enhance user experience.
The following ports can be verified:
|Inbound rule||TCP: 3389||It is used to permit Windows remote login.|
|TCP: 22||It is used to permit Linux SSH login.|
|TCP: 443||It is used to provide website HTTPS service.|
|TCP: 80||It is used to provide website HTTP service.|
|TCP: 21||It is used to permit the upload and download features for FTP service.|
|ICMP protocol||It is used to provide website HTTP service.|
|Outbound rule||All||It is used to permit all outbound traffic for accessing external networks.|
Open All Ports will open all listed ports. To open certain ports, add rules in Security Group Console.