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Well-known and Registered Ports
Port Number Protocol Description
20 TCP FTP Data
21 TCP FTP Control
22 TCP & UDP SSH Remote Login Protocol
23 TCP Telnet
25 TCP SMTP (Simple Mail Transfer Protocol)
53 TCP & UDP DNS (Domain Name Server)
69 UDP TFTP (Trivial File Transfer Protocol)
80 TCP World Wide Web HTTP
110 TCP POP3 (Post Office Protocol Version 3)
119 TCP NEWS (Network News Transfer Protocol)
123 UDP NTP (Network Time Protocol)
161 TCP SNMP
443 TCP & UDP HTTPS
1503 TCP T.120
1720 TCP H.323
4000 TCP ICQ
7070 UDP RealAudio
Item: Item number
Type: Select TCP if you wish to search for connection-based application services on the
remote server using the port number.
Port Start & Port End: Enter the public port number & range you wish to configure.
IP Address: Enter the IP address of a specific internal server to which requests from the
specified port is forwarded.
Add: Click to add a new virtual server rule. Click again and the next figure appears.
Edit: Check the Rule No. you wish to edit and then click “Edit”.
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