20 & 21
FTP
File Transfer Protocol
22
SSH (SFTP)
Secure Shell (Secure File Transport Protocol)
23
TELNET
25
SMTP
Simple Mail Transfer Protocol
49
TACACS
Terminal Access Controller Access-Control System
53
DNS
Domain Name Service
67 & 68
DHCP
Dynamic Host Configuration Protocol
69
TFTP
Trivial File Transfer Protocol
80
HTTP
Hypertext Transfer Protocol
110
POP3
Post Office Protocol v3
137-139
NetBIOS
143
IMAP4
Internet Message Access Protocol v4
161 & 162
SNMP
Simple Network Management Protocol
389
LDAP
Lightweight Directory Access Protocol
443
HTTPS/ SSL
Hypertext Transport Protocol over Secure Sockets Layer
500 & 4500
IKE
Internet Key Exchange
636
Sec LDAP
Secure Lightweight Directory Access Protocol
990
FTPS (control)
File Transfer Protocol Secure (SSL)
989
FTPS (Data)
File Transfer Protocol Secure (SSL)
1293
IPSec
Internet Protocol Security
1701 UDP
L2TP
Layer 2 Tunneling Protocol
1723 TCP
PPTP
Point-to-Point Tunneling Protocol
1812
RADIUS
Remote Authentication Dial-In Service
3389
RDP
Remote Desktop Protocol