The following table lists commonly used ECS instance ports.
|21||FTP||A port opened by the FTP service is used for uploading and downloading files.|
|22||SSH||An SSH port is used to connect to a Linux instance by using a password in command-line mode.|
|23||Telnet||The Telnet port is used for Telnet to log on to the ECS instance.|
|25||SMTP||The port that is open to the SMTP service is used for sending mails.
Based on security concerns, ECS instance Port 25 is restricted by default. See apply to open TCP port 25to remove the limit.
|80||HTTP||Provides access to HTTP services, such as IIS, Apache, and Nginx.
We recommend that you verify if TCP port 80 works properly .
|110||POP3||A port used for the POP3 protocol, which is a protocol for sending and receiving emails.|
|143||IMAP||A port used for IMAP (Internet Message Access Protocol), which is a protocol for receiving emails.|
|443||HTTPS||A port used to provide access to the HTTPS service. HTTPS is a protocol that provides encryption and transmission through secure ports.|
|1433||SQL Server||The TCP port of the SQL Server that is used for external service by SQL Server.|
|1434||SQL Server||The SQL Server UDP port that is used to return which TCP/IP port SQL Server uses.|
|1521||Oracle||An Oracle communications port. The port that needs to be released by Oracle SQL is deployed on the ECS instance.|
|3306||MySQL||The port through which the MySQL database provides external service.|
|3389||Windows Server Remote Desktop Services||The Windows Server Remote Desktop Services port can be used to connect to a Windows instance.|
|8080||Proxy port||Similar to 80 port, port 8080 is used by WWW agents to enable web browsing. If you are using port 8080, when you visit a Web site or use a proxy server, you must add
|137, 138, 139||NetBIOS protocol||
Some ports cannot be accessed
Issue: An ECS instance attempts to listen for the corresponding port, but the port is not accessible, while other ports can be accessed normally.
Cause: Some operators determine that port numbers 135, 139, 444, 445, 5800, 5900, and related ports, are high-risk ports, which are then blocked by default.
Resolution: We recommend that you change the port to another port number
For more information on how to release a service port through a security group, see add security group rules.