The following is a list of commonly used ports of the server:
Port service description
The FTP service of 2 1 FTP has an open port for uploading and downloading files.
22SSHSSH port, which is used to remotely connect Linux server or vps through command line. 23TelnetTelnet port, used to telnet to the server.
25SMTPSMTP service open port, used to send mail.
80HTTP is used for HTTP services to provide access functions, such as IIS, Apache, Nginx and other services. You can refer to checking whether TCP80 port 80 works normally and troubleshooting port 80.
110ppop3 is used for the POP3 protocol, which is a protocol for sending and receiving emails.
143 map is used for the IMAP (Internet Mail Access Protocol) protocol, which is a protocol for receiving e-mail.
443HTTPS is used to provide access function for HTTPS service. HTTPS is a protocol that can provide encryption and transmission through secure ports.
1433 SQL Server The TCP port of SQL Server is used for SQL Server to provide external services.
1434 UDP port of SQLServer, which is used to return the TCP/IP port used by SQL server.
152 1 Oracle communication port, and the port that OracleSQL needs to release is deployed on the server. 3306MySQLMySQL database provides external service port.
3389 Windows Server Remote Desktop Services port, through which you can connect to the server remotely.
The 8080 proxy port is the same as the 80 port. WWW proxy services usually use port 8080 to browse web pages. If you use port 8080, you need to add: 8080 after the IP address when you visit a website or use a proxy server. After installing ApacheTomcat service, the default service port is 8080.
NetBIOS protocols 137, 138 and 139.
137 and 138 are UDP ports, which are used when transferring files through network neighbors.
139 The connection entered through this port attempts to obtain NetBIOS/SMB service.
NetBIOS protocol is usually used for Windows files, printers and Samba.
For security reasons, it is recommended that the client open the firewall and add the public port to the firewall exception or inbound rule. For example, webmasters generally only open ports 80, 22, 2 1, 3306, 1433, etc.