Server Common Port

Last updated: 2018-08-01 17:55:30


The following describes the common server ports. For more information on service application ports on Windows, please see Microsoft official document (Windows Service Overview and Network Port Requirements).

Port Service Description
21 FTP FTP server's open port for upload and download.
22 SSH Port 22 is the SSH port, used to remotely connect to Linux system servers in command-line mode.
25 SMTP SMTP server's open port for sending emails.
80 HTTP Used for Web services, such as IIS, Apache, Nginx, to provide external access.
110 POP3 Port 110 is open for POP3 (email protocol 3) service.
137, 138, 139 NETBIOS protocol Port 137 and 138 are UDP ports used to transfer files via My Network Places.
Port 139: Incoming connections over port 139 attempt to obtain NetBIOS/SMB service. This protocol is used for file and printer sharing on Windows as well as SAMBA service.
143 IMAP Port 143 is mainly used for "Internet Message Access Protocol" (IMAP) v2, a protocol for receiving emails as the same as POP3.
443 HTTPS Web browsing port. This is another type of HTTP that supports encryption and transfer over secure ports.
1433 SQL Server Port 1433 is the default port for SQL Server. The SQL Server service uses two ports: TCP-1433 and UDP-1434. Port 1433 is used by SQL Server to provide external services, and port 1434 is used to send requester a response about which TCP/IP port is used by SQL Server.
3306 MySQL Port 3306 is the default port for MySQL database and is used by MySQL to provide external services.
3389 Windows Server Remote Desktop Services Port 3389 is the service port for remote desktop on Windows 2000 (2003) Server. You can connect to a remote server using the "Remote Desktop" connection tool via this port.
8080 Proxy Port Just like port 80, port 8080 is used for WWW proxy service for web browsing. Port number ":8080" is often added when users visit a website or use a proxy server. In addition, after Apache Tomcat Web server is installed, the default service port is 8080.