TCP 20
FTP Data
TCP 21
FTP Control
TCP 23
Telnet
TCP 22
SSH
TCP 25
SMTP (Simple Mail Transfer Protocol)
TCP 53
DNS zone transfers
TCP 80
HTTP
TCP 110
POP3
TCP 139
NetBIOS Session Service
TCP 143
IMAP (Internet Message Access Protocol)
TCP 443
HTTPS
TCP 3389
RDP (Remote Desktop Protocol)
TCP 49
TACACS+
TCP 88
Kerberos
UDP 1812/1813
RADIUS (Remote Authentication Dial In User Service)
UDP 88
Kerberos
UDP 53
DNS (Domain Name System)
UDP 67, 68
DHCP (Dynamic Host Configuration Protocol)
UDP 69
TFTP (Trivial File Transfer Protocol)
UDP 137,138
NetBIOS Name Service
UDP 161
SNMP (Simple Network Management Protocol)