Ports commonly used by servers and their uses

What is the port to connect to the server? Port generally refers to the port in the TCP/IP protocol. The port number ranges from 0 to 65535. Generally, you need to open port 22 to connect to Linux CVM and port 3389 to connect to Windows server. Here, I will give you a brief introduction to these two ports.

3389 is the remote login port of the server, and it is the default port for many servers to connect remotely, so many * scan this port. To ensure security, you can modify the port of remote connection.

Port 22 is the ssh port. PcAnywhere may establish the connection between TCP and this port in order to find ssh. The equipment used to connect linux port 22 is SSH Secure Shell and so on.

Users need to open the port in the security group before they can use the service corresponding to the port. After modifying the port of the service, you also need to open the corresponding port in the corresponding security group, otherwise the service cannot be used. In addition, the more common server ports are: port 80, port 443, port 21, and so on.

Generally, 80 is the access port of the web server and the default port of the http protocol. In fact, the browser (non-IE) has already entered the protocol for you when entering the website.

Port 21 is mainly used for FTP (File Transfer Protocol, File transfer Protocol) service, and FTP service is mainly used to upload and download files between two computers.