Ports 20/21
File Transfer Protocol
Port 22
Secure Shell
Port 23
Telnet
Port 53
Domain Name System
Ports 67/68
Dynamic Host Configuration Protocol
Port 80
Hypertext Transfer Protocol
Port 110
Post Office Protocol v3
Ports 137/138
NetBIOS over TCP/IP
Port 143
Internet Mail Access Protocol
Ports 161/162
Simple Network Management Protocol
Port 389
Lightweight Directory Access Protocol
Port 443
Hypertext Transfer Protocol Secure
Port 445
Server Message Block/Common Internet File System
Port 3389
Remote Desktop Protocol