Ports

FTP

Port 20 - (File Transfer Protocol) TCP data sending
Port 21 - FTP (File Transfer Protocol) TCP Command or Control port

SSH

Port 22 - Secure Shell-TCP Remote access

Telnet

Port 23 - Telnet TCP

SMTP

Port 25 - (Simple Mail Transfer Protocol) TCP

HTTP

Port 80 HTTP-(Hyper Text Transfer Protocol) TCP

DNS

Port 53 - Domain Name System

SFTP

Port 22 - Secure File Transfer Protocol (Uses SSH)

DHCP

Pot 67 and 68 - Dynamic Host Configuration Protocol

HTTPS

Port 443 - Hypertext Transfer Protocol Secure

SNMP

Port 161 - Simple Network Management Protocol

RDP

Port 3389 - Remote Desktop Protocol

NTP

Port 123 - Network Time Protocol

POP3

Port 110 - default, non-encrypted port; Post Office Protocol.
Port 995 - should be used when the user needs to connect using POP3 securely

NetBIOS

Port 137 to 139 - NetBIOS Name service
Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet. Therefore it is advisable to block port 137 in the Firewall.

IMAP

Port 143 - Internet Message Access Protocol

LDAP

Port 389 - Lightweight Directory Access Protocol

SMB

Port 445 - Server Message Block

Syslog

Port 514 - Syslog is a protocol that computer systems use to send event data logs to a central location for storage.

SMTP TLS

Port 587 - (Simple Mail Transfer Protocol) Transport Layer Security

LDAPS

Port 636 - Lightweight Directory Access Protocol

LDAPS stands for LDAP over SSL or Secure LDAP. LDAP uses TCP as a transmission protocol. LDAPS uses TLS/SSL as a transmission protocol.

IMAP over SSL

Port 993

POP3 over SSL

Port 995

SQL Server

Port 1433 - Structured Query Language Server

SQLnet

Port 1521

MySQL

Port 3306

RDP

Port 3389 - Remote Desktop Protocol
is a proprietary protocol developed by Microsoft Corporation which provides a user with a graphical interface to connect to another computer over a network connection. The user employs RDP client software for this purpose, while the other computer must run RDP server software.

SIP

Port 5060/5061 - Session Initiation Protocol (SIP)
is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications.[1] SIP is used in Internet telephony, in private IP telephone systems, as well as mobile phone calling over LTE (VoLTE).[2]