Ports

Front 1

FTP

Back 1

Port 21

Front 2

SSH

Back 2

Port 22

Front 3

Telnet

Back 3

Port 23

Front 4

SMTP

Back 4

Port 25

Front 5

DNS

Back 5

Port 53

Front 6

HTTP

Back 6

Port 80

Front 7

POP3

Back 7

Port 110

Front 8

IMAP

Back 8

Port 143

Front 9

SLP

Back 9

Port 427

Front 10

HTTPS

Back 10

Port 443

Front 11

SMB

Back 11

Port 445, 137-139

Front 12

AFP

Back 12

Port 548

Front 13

RDP

Back 13

Port 3389