1SMTP (Simple Mail Transfer Protocol)
25
2SSH (Secure Shell), SCP, SFTP
22
3DNS (Domain Name System)
53
4TFTP (Trivial File Transfer Protocol)
69
5HTTP (Hypertext Transfer Protocol)
80
7NNTP (Network News Transfer Protocol)
119
8FTP (File transfer Protocol)
21
10POP3 (Post Office Protocol version 3)
110
13IMAP (Internet Message Access Protocol)
143
14SNMP (Simple Network Management Protocol)
161
15SNMPTRAP - Simple Network Management Protocol Trap
162
16LDAP (Lightweight Directory Access Protocol)
389
17HTTPS (Hypertext Transfer Protocol Secure)
443
18SMB (Server Message Block)
445
19SMTP (with SSL/TLS)
465 OR 587
23FTPS (File Transfer Protocol Secure)
989/990
27RADIUS (Remote Authentication Dial-In User Service) Alternative
1645 (Authentication and Authorization) 1646 (Accounting)
28L2TP (Layer 2 Tunneling Protocol)
1701
29PPTP (Point-to-Point Tunneling Protocol)
1723
30RADIUS (Remote Authentication Dial-In User Service)
1812 (Authentication and Authorization) 1813 (Accounting)
31FCIP (Fibre Channel over IP)
3225
33RDP (Remote Desktop Protocol)
3389