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Server Common Port

Last updated: 2024-01-08 09:41:35
This document describes common server ports. For more information on service application ports for Windows, see Service Overview and Network Port Requirements for Windows.
Port
Service
Description
21
FTP
An open FTP server port for uploading and downloading.
22
SSH
An SSH port for remotely connecting to Linux servers in CLI mode.
25
SMTP
An open SMTP server port for sending emails.
80
HTTP
A port for web services, such as IIS, Apache, and Nginx, to provide external access.
110
POP3
A port for the POP3 (email protocol 3) service.
137, 138, 139
NetBIOS protocol
Ports 137 and 138 are UDP ports for transferring files through My Network Places.
Port 139: connections established through port 139 attempt to access the NetBIOS/SMB service. This protocol is used for file and printer sharing on Windows and SAMBA.
143
IMAP
A port for Internet Message Access Protocol (IMAP) v2, which is a protocol for receiving emails like POP3.
443
HTTPS
A port for web browsing. HTTPS is a variant of HTTP that provides encryption and transmission over secure ports.
1433
SQL Server
Default port for SQL Server. The SQL Server service uses two ports: TCP-1433 and UDP-1434. Port 1433 is used to provide external services, and port 1434 is used to return a response to the requester to indicate the TCP/IP port used by SQL Server.
3306
MySQL
Default port for MySQL databases, which is used by MySQL to provide external services.
3389
Windows Server Remote Desktop Services
Service port for the Windows Server remote desktop, through which you can connect to a remote server by using the "Remote Desktop" connection tool.
8080
Proxy port
Similar to port 80, port 8080 is used in the WWW proxy service for web browsing. The port number ":8080" is often appended to the URL when you visit a website or use a proxy. In addition, after the Apache Tomcat web server is installed, its default service port is port 8080.

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