Shulou(Shulou.com)06/02 Report--

What this article shares with you is whether the 25 ports of the CVM should be disabled or not. The editor thinks it is very practical, so I hope you can learn something after reading this article. Let's take a look at it with the editor.

Port 25 is generally a SMTP service in the server, and the port opened by the SMTP server is used to send mail. SMTP is a set of rules for sending messages from the source address to the destination address, which controls how the message is transferred.

In accordance with the principle of server security, do not open the ports on the CVM if they are not essential. Therefore, if the user has a need for mail delivery, port 25 can be opened, if not, it is best to disable it.

Let's introduce the port descriptions commonly used by the server.

The port opened by the FTP server for uploading and downloading.

Port 22 is the SSH port, which is used to remotely connect to the Linux system server through command line mode.

80:HTTP, which is used to provide external access to website services such as IIS, Apache, Nginx, etc.

The 110:POP3110 port is open for POP3 (Mail Protocol 3) services.

443:HTTPS, a web browsing port, is another HTTP that provides encryption and transmission over a secure port.

Port 3306 is the default port for MySQL database, which is used for MySQL to provide services.

3389:Windows remote Desktop Service, Port 3389 is the service port of Windows 2000 (2003) Server remote Desktop, through which you can use the "remote Desktop" connection tool to connect to the cloud host.

The above is whether port 25 of the CVM should be disabled. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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