TCP port 21 — FTP (File Transfer Protocol)

TCP port 22 — SSH (Secure Shell)

TCP port 23 — Telnet

TCP port 25 — SMTP (Simple Mail Transfer Protocol)

TCP and UDP port 53 — DNS (Domain Name System)

TCP port 443 — HTTP (Hypertext Transport Protocol) and HTTPS (HTTP over SSL)

TCP port 110 — POP3 (Post Office Protocol version 3)

TCP and UDP port 135 — Windows RPC

TCP and UDP ports 137–139 — Windows NetBIOS over TCP/IP

TCP port 1433 and UDP port 1434 — Microsoft SQL Server

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